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"destinations_with_at_least_5pct_of_former_premises": 3, "largest_premises_destination_2024_name": "Inverness, Skye and West Ross-shire", "largest_destination_premises_pct_of_former_constituency": 48.275318947865806, "effective_premises_destination_count": 2.339602193112998, "comparison_url": "/boundary-changes/constituency/S14000055/ross-skye-and-lochaber", "closest_successor_url": "/constituency/S14000069/caithness-sutherland-and-easter-ross", "source_url": "https://commonslibrary.parliament.uk/boundary-review-2023-which-seats-will-change/", "source_file_url": "https://commonslibrary.parliament.uk/content/uploads/2023/07/Boundary_changes_data_file.xlsx", "source_summary_cells": "Summary and closest successors!A608:F608" } ], "rounding_examples": [ { "former_code": "S14000008", "former_name": "Berwickshire, Roxburgh and Selkirk", "country": "Scotland", "former_election": "2019-12-12", "new_election": "2024-07-04", "boundary_changed": true, "change_type_from_commons_summary": "small_change", "closest_successor_has_different_name": false, "closest_successor_2024_code": "S14000108", "closest_successor_2024_name": "Berwickshire, Roxburgh and Selkirk", "closest_successor_premises_pct_of_former_constituency": 99.9980399459025, "closest_successor_premises_pct_of_2024_constituency": 100, "closest_successor_estimated_population_pct_of_former_constituency": 100, "closest_successor_estimated_population_pct_of_2024_constituency": 100, "closest_successor_area_pct_of_former_constituency": 99.87889183598453, "closest_successor_area_pct_of_2024_constituency": 99.89683500060916, "raw_overlap_destination_count": 2, "positive_premises_destination_count": 2, "destinations_with_at_least_1pct_of_former_premises": 1, "destinations_with_at_least_5pct_of_former_premises": 1, "largest_premises_destination_2024_name": "Berwickshire, Roxburgh and Selkirk", "largest_destination_premises_pct_of_former_constituency": 99.9980399459025, "effective_premises_destination_count": 1.0000392018503121, "comparison_url": "/boundary-changes/constituency/S14000008/berwickshire-roxburgh-and-selkirk", "closest_successor_url": "/constituency/S14000108/berwickshire-roxburgh-and-selkirk", "source_url": "https://commonslibrary.parliament.uk/boundary-review-2023-which-seats-will-change/", "source_file_url": "https://commonslibrary.parliament.uk/content/uploads/2023/07/Boundary_changes_data_file.xlsx", "source_summary_cells": "Summary and closest successors!A561:F561" }, { "former_code": "E14000561", "former_name": "Birmingham, Erdington", "country": "England", "former_election": "2019-12-12", "new_election": "2024-07-04", "boundary_changed": true, "change_type_from_commons_summary": "changed", "closest_successor_has_different_name": false, "closest_successor_2024_code": "E14001093", "closest_successor_2024_name": "Birmingham Erdington", "closest_successor_premises_pct_of_former_constituency": 99.98457130262288, "closest_successor_premises_pct_of_2024_constituency": 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"https://commonslibrary.parliament.uk/content/uploads/2023/07/Boundary_changes_data_file.xlsx", "source_summary_cells": "Summary and closest successors!A34:F34" }, { "former_code": "W07000068", "former_name": "Brecon and Radnorshire", "country": "Wales", "former_election": "2019-12-12", "new_election": "2024-07-04", "boundary_changed": true, "change_type_from_commons_summary": "enlarged", "closest_successor_has_different_name": true, "closest_successor_2024_code": "W07000085", "closest_successor_2024_name": "Brecon, Radnor and Cwm Tawe", "closest_successor_premises_pct_of_former_constituency": 99.98329853862214, "closest_successor_premises_pct_of_2024_constituency": 77.29502905100064, "closest_successor_estimated_population_pct_of_former_constituency": 100, "closest_successor_estimated_population_pct_of_2024_constituency": 75.41494677384316, "closest_successor_area_pct_of_former_constituency": 99.97092367569293, "closest_successor_area_pct_of_2024_constituency": 97.28044004008939, "raw_overlap_destination_count": 2, "positive_premises_destination_count": 2, "destinations_with_at_least_1pct_of_former_premises": 1, "destinations_with_at_least_5pct_of_former_premises": 1, "largest_premises_destination_2024_name": "Brecon, Radnor and Cwm Tawe", "largest_destination_premises_pct_of_former_constituency": 99.98329853862214, "effective_premises_destination_count": 1.0003340850153166, "comparison_url": "/boundary-changes/constituency/W07000068/brecon-and-radnorshire", "closest_successor_url": "/constituency/W07000085/brecon-radnor-and-cwm-tawe", "source_url": "https://commonslibrary.parliament.uk/boundary-review-2023-which-seats-will-change/", "source_file_url": "https://commonslibrary.parliament.uk/content/uploads/2023/07/Boundary_changes_data_file.xlsx", "source_summary_cells": "Summary and closest successors!A640:F640" }, { "former_code": "S14000024", "former_name": "Edinburgh South", "country": "Scotland", "former_election": "2019-12-12", "new_election": "2024-07-04", "boundary_changed": true, "change_type_from_commons_summary": "enlarged", "closest_successor_has_different_name": false, "closest_successor_2024_code": "S14000080", "closest_successor_2024_name": "Edinburgh South", "closest_successor_premises_pct_of_former_constituency": 99.99049000261525, "closest_successor_premises_pct_of_2024_constituency": 93.87932766356391, "closest_successor_estimated_population_pct_of_former_constituency": 100, "closest_successor_estimated_population_pct_of_2024_constituency": 94.43853331150761, "closest_successor_area_pct_of_former_constituency": 99.92988796026286, "closest_successor_area_pct_of_2024_constituency": 92.01612385173765, "raw_overlap_destination_count": 3, "positive_premises_destination_count": 3, "destinations_with_at_least_1pct_of_former_premises": 1, "destinations_with_at_least_5pct_of_former_premises": 1, "largest_premises_destination_2024_name": "Edinburgh South", "largest_destination_premises_pct_of_former_constituency": 99.99049000261525, "effective_premises_destination_count": 1.000190221428497, "comparison_url": "/boundary-changes/constituency/S14000024/edinburgh-south", "closest_successor_url": "/constituency/S14000080/edinburgh-south", "source_url": "https://commonslibrary.parliament.uk/boundary-review-2023-which-seats-will-change/", "source_file_url": "https://commonslibrary.parliament.uk/content/uploads/2023/07/Boundary_changes_data_file.xlsx", "source_summary_cells": "Summary and closest successors!A577:F577" }, { "former_code": "E14000737", "former_name": "Hayes and Harlington", "country": "England", "former_election": "2019-12-12", "new_election": "2024-07-04", "boundary_changed": true, "change_type_from_commons_summary": "small_change", "closest_successor_has_different_name": false, "closest_successor_2024_code": "E14001276", "closest_successor_2024_name": "Hayes and Harlington", "closest_successor_premises_pct_of_former_constituency": 99.99777386968233, "closest_successor_premises_pct_of_2024_constituency": 99.99777386968233, "closest_successor_estimated_population_pct_of_former_constituency": 100, "closest_successor_estimated_population_pct_of_2024_constituency": 100, "closest_successor_area_pct_of_former_constituency": 99.96116125624471, "closest_successor_area_pct_of_2024_constituency": 99.97580546707657, "raw_overlap_destination_count": 2, "positive_premises_destination_count": 2, "destinations_with_at_least_1pct_of_former_premises": 1, "destinations_with_at_least_5pct_of_former_premises": 1, "largest_premises_destination_2024_name": "Hayes and Harlington", "largest_destination_premises_pct_of_former_constituency": 99.99777386968233, "effective_premises_destination_count": 1.0000445235974849, "comparison_url": "/boundary-changes/constituency/E14000737/hayes-and-harlington", "closest_successor_url": "/constituency/E14001276/hayes-and-harlington", "source_url": "https://commonslibrary.parliament.uk/boundary-review-2023-which-seats-will-change/", "source_file_url": "https://commonslibrary.parliament.uk/content/uploads/2023/07/Boundary_changes_data_file.xlsx", "source_summary_cells": "Summary and closest successors!A210:F210" }, { "former_code": "E14000779", "former_name": "Leeds North East", "country": "England", "former_election": "2019-12-12", "new_election": "2024-07-04", "boundary_changed": true, "change_type_from_commons_summary": "small_change", "closest_successor_has_different_name": false, "closest_successor_2024_code": "E14001321", "closest_successor_2024_name": "Leeds North East", "closest_successor_premises_pct_of_former_constituency": 99.9560734267351, "closest_successor_premises_pct_of_2024_constituency": 100, "closest_successor_estimated_population_pct_of_former_constituency": 100, "closest_successor_estimated_population_pct_of_2024_constituency": 100, "closest_successor_area_pct_of_former_constituency": 99.79906415522167, "closest_successor_area_pct_of_2024_constituency": 100, "raw_overlap_destination_count": 3, "positive_premises_destination_count": 3, "destinations_with_at_least_1pct_of_former_premises": 1, "destinations_with_at_least_5pct_of_former_premises": 1, "largest_premises_destination_2024_name": "Leeds North East", "largest_destination_premises_pct_of_former_constituency": 99.9560734267351, "effective_premises_destination_count": 1.000878968776126, "comparison_url": "/boundary-changes/constituency/E14000779/leeds-north-east", "closest_successor_url": "/constituency/E14001321/leeds-north-east", "source_url": "https://commonslibrary.parliament.uk/boundary-review-2023-which-seats-will-change/", "source_file_url": "https://commonslibrary.parliament.uk/content/uploads/2023/07/Boundary_changes_data_file.xlsx", "source_summary_cells": "Summary and closest successors!A252:F252" }, { "former_code": "E14000815", "former_name": "Mid Dorset and North Poole", "country": "England", "former_election": "2019-12-12", "new_election": "2024-07-04", "boundary_changed": true, "change_type_from_commons_summary": "enlarged", "closest_successor_has_different_name": false, "closest_successor_2024_code": "E14001363", "closest_successor_2024_name": "Mid Dorset and North Poole", "closest_successor_premises_pct_of_former_constituency": 99.99736418988377, "closest_successor_premises_pct_of_2024_constituency": 88.32856045260878, "closest_successor_estimated_population_pct_of_former_constituency": 100, "closest_successor_estimated_population_pct_of_2024_constituency": 88.7043713147578, "closest_successor_area_pct_of_former_constituency": 99.98497887619823, "closest_successor_area_pct_of_2024_constituency": 57.71390415394342, "raw_overlap_destination_count": 2, "positive_premises_destination_count": 2, "destinations_with_at_least_1pct_of_former_premises": 1, "destinations_with_at_least_5pct_of_former_premises": 1, "largest_premises_destination_2024_name": "Mid Dorset and North Poole", "largest_destination_premises_pct_of_former_constituency": 99.99736418988377, "effective_premises_destination_count": 1.0000527175918237, "comparison_url": "/boundary-changes/constituency/E14000815/mid-dorset-and-north-poole", "closest_successor_url": "/constituency/E14001363/mid-dorset-and-north-poole", "source_url": "https://commonslibrary.parliament.uk/boundary-review-2023-which-seats-will-change/", "source_file_url": "https://commonslibrary.parliament.uk/content/uploads/2023/07/Boundary_changes_data_file.xlsx", "source_summary_cells": "Summary and closest successors!A288:F288" }, { "former_code": "E14000845", "former_name": "North East Hertfordshire", "country": "England", "former_election": "2019-12-12", "new_election": "2024-07-04", "boundary_changed": true, "change_type_from_commons_summary": "small_change", "closest_successor_has_different_name": false, "closest_successor_2024_code": "E14001393", "closest_successor_2024_name": "North East Hertfordshire", "closest_successor_premises_pct_of_former_constituency": 99.95167702681925, "closest_successor_premises_pct_of_2024_constituency": 100, "closest_successor_estimated_population_pct_of_former_constituency": 100, "closest_successor_estimated_population_pct_of_2024_constituency": 100, "closest_successor_area_pct_of_former_constituency": 99.99685540474324, "closest_successor_area_pct_of_2024_constituency": 100, "raw_overlap_destination_count": 2, "positive_premises_destination_count": 2, "destinations_with_at_least_1pct_of_former_premises": 1, "destinations_with_at_least_5pct_of_former_premises": 1, "largest_premises_destination_2024_name": "North East Hertfordshire", "largest_destination_premises_pct_of_former_constituency": 99.95167702681925, "effective_premises_destination_count": 1.000966926485344, "comparison_url": "/boundary-changes/constituency/E14000845/north-east-hertfordshire", "closest_successor_url": "/constituency/E14001393/north-east-hertfordshire", "source_url": "https://commonslibrary.parliament.uk/boundary-review-2023-which-seats-will-change/", "source_file_url": "https://commonslibrary.parliament.uk/content/uploads/2023/07/Boundary_changes_data_file.xlsx", "source_summary_cells": "Summary and closest successors!A318:F318" }, { "former_code": "E14000925", "former_name": "Shipley", "country": "England", "former_election": "2019-12-12", "new_election": "2024-07-04", "boundary_changed": true, "change_type_from_commons_summary": "small_change", "closest_successor_has_different_name": false, "closest_successor_2024_code": "E14001472", "closest_successor_2024_name": "Shipley", "closest_successor_premises_pct_of_former_constituency": 99.99560236592713, "closest_successor_premises_pct_of_2024_constituency": 100, "closest_successor_estimated_population_pct_of_former_constituency": 100, "closest_successor_estimated_population_pct_of_2024_constituency": 100, "closest_successor_area_pct_of_former_constituency": 99.86992105880262, "closest_successor_area_pct_of_2024_constituency": 100, "raw_overlap_destination_count": 2, "positive_premises_destination_count": 2, "destinations_with_at_least_1pct_of_former_premises": 1, "destinations_with_at_least_5pct_of_former_premises": 1, "largest_premises_destination_2024_name": "Shipley", "largest_destination_premises_pct_of_former_constituency": 99.99560236592713, "effective_premises_destination_count": 1.0000879565492944, "comparison_url": "/boundary-changes/constituency/E14000925/shipley", "closest_successor_url": "/constituency/E14001472/shipley", "source_url": "https://commonslibrary.parliament.uk/boundary-review-2023-which-seats-will-change/", "source_file_url": "https://commonslibrary.parliament.uk/content/uploads/2023/07/Boundary_changes_data_file.xlsx", "source_summary_cells": "Summary and closest successors!A398:F398" } ], "methods": { "closest_successor": "The site uses the successor named in the Commons Summary and closest successors sheet. It does not recalculate the pairing from map area or residential premises. All 650 selected successors have the largest share of the old estimated population in this source.", "old_direction": "For an old-to-new pair, the old residential-premises share has all premises in the former seat as denominator. It shows where the old premises lie in the 2024 constituency system.", "new_direction": "For the same pair, the new residential-premises share has all premises in the 2024 seat as denominator. It shows how much of the new seat came from the former seat. These percentages answer different questions.", "thresholds": "Use unrounded old residential-premises shares. Positive means >0. Each non-zero threshold uses >=; for example 5% means a destination contains at least 5% of the former seat premises.", "effective_destination_count": "Optional concentration measure: 1 / sum(old_premises_share squared). Equal halves score 2, equal fifths score 5. This is not an official boundary classification.", "name_change": "Compare the former name with its selected closest successor after removing accents, case and non-alphanumeric characters, as the site import does. This counts old-to-successor pairings, not a separate count of newly created names.", "boundary_change": "Use the Commons summary classification, not generalised map edges or a rounded share.", "display_rounding": "The site boundaryPercent helper displays shares between 0 and 0.1% as <0.1%; other shares use one decimal. Download calculations retain full precision." }, "limitations": [ "Residential premises are not votes, registered electors, people, households or a count of homes newly built. No statement about actual people moving house follows from these overlaps.", "Population overlaps are calculated using 2021 Output Area Population Weighted Centroids for England and Wales, 2011 Datazone Centroids in Scotland, and the address-weighted centroids of 2021 Datazones for Northern Ireland Cells marked with a zero indicate that a population cannot be calculated for this overlap, because no output area or datazone centroid is located in the overlap", "Raw population zeros mean the source cannot calculate a population overlap. CSV population fields are blank for these 69 pairs. Premises and area fields remain usable.", "The source population shares for East Londonderry do not sum to 100%. The import preserves them. All old and new residential-premises and area shares reconcile to 100%.", "A raw overlap row can contain geographical area but zero residential premises. Counting all 1,434 rows as meaningful population transfers would overstate fragmentation.", "The source Summary has 265 split labels, but threshold-based destination counts answer a different question and must not be described as the source split classification.", "The 2023 ward-membership sheet is not a record of ward boundary changes or necessarily the current ward membership.", "Map geometry differences are not counts or shares of voters, residents, households or residential premises.", "Different dated and generalised sources can produce small edge differences. Do not label every thin edge as an electoral transfer.", "Constituencies classed as unchanged by the official Commons record may still have small cartographic differences between these snapshots.", "These maps support visual comparison, not legal boundary determination.", "Country totals count the 650 former seats and their destinations; closest-successor pairings are not necessarily one-to-one.", "The comparison describes the 2019-to-2024 Westminster change. It does not cover every historical review or any future review." ], "geometry_sources": { "sources": { "old": { "title": "Westminster Parliamentary Constituencies (December 2022) Boundaries UK BGC", "snapshot": "2022-12", "code_field": "PCON22CD", "name_field": "PCON22NM", "url": "https://geoportal.statistics.gov.uk/datasets/ons::westminster-parliamentary-constituencies-december-2022-boundaries-uk-bgc/about", "service": "https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/Westminster_Parliamentary_Constituencies_Dec_2022_UK_BGC/FeatureServer/0", "query_url": "https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/Westminster_Parliamentary_Constituencies_Dec_2022_UK_BGC/FeatureServer/0/query?f=geojson&where=1%3D1&outFields=%2A&outSR=4326", "sha256": "b1f7a4ec2cc34bdfef332e8289c777bd8710dfd44d8768a5b46bb32acc037efe" }, "current": { "title": "Westminster Parliamentary Constituencies (July 2024) Boundaries UK BGC", "snapshot": "2024-07-04", "code_field": "PCON24CD", "name_field": "PCON24NM", "url": "https://geoportal.statistics.gov.uk/datasets/ons::westminster-parliamentary-constituencies-july-2024-boundaries-uk-bgc-2/about", "service": "https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/Westminster_Parliamentary_Constituencies_July_2024_Boundaries_UK_BGC/FeatureServer/0", "query_url": "https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/Westminster_Parliamentary_Constituencies_July_2024_Boundaries_UK_BGC/FeatureServer/0/query?f=geojson&where=1%3D1&outFields=%2A&outSR=4326", "sha256": "4bdc6d2d5e86211666b3f43a8276afc283ead43ed714c9940d53533a9f3e0285" } }, "effective_date": "2024-07-04", "resolution": "Both snapshots are generalised to 20 metres and clipped to the coastline (BGC).", "processing": "Intersections and differences calculated in ETRS89 / LAEA Europe EPSG:3035, then exported in longitude/latitude EPSG:4326. No simplification or components removed.", "pairing": "Each former constituency is paired with the closest successor named in the supplied Commons Summary and closest successors worksheet. Other successors are stored separately in the overlap records.", "licence": "Open Government Licence v3.0", "licence_url": "https://www.ons.gov.uk/methodology/geography/licences", "attribution": [ "Source: Office for National Statistics licensed under the Open Government Licence v.3.0", "Contains OS data © Crown copyright and database right 2022 and 2024" ] } }