Gera Local Crime Index — Methodology
Published 23 April 2026 · Updated annually with each Home Office CSP release
1. Purpose
The Gera Local Crime Index (GLCI) is a normalised 0–100 score computed by GeraRent from official Home Office police-recorded-crime open data at Community Safety Partnership (CSP) level. It allows renters and home-movers to compare crime contexts across 310 local areas in England and Wales on a single consistent scale.
A score of 100 corresponds to the lowest recorded-crime rate among all 310 included CSPs; a score of 0 corresponds to the highest. All intermediate scores are linear interpolations on the same scale.
2. Source data
| Dataset | Publisher | Licence | Used for |
|---|---|---|---|
| Police recorded crime CSP open data tables (file prc-csp-mar21-dec25-tables-230426.ods, sheet 2024_25) | Home Office | OGL v3.0 | Offence counts by CSP × offence group, 2024/25 (Apr 2024–Mar 2025) |
| Mid-2023 population estimates for local authorities in England and Wales (Nomis API, dataset NM_31_1, geography TYPE464) | ONS via Nomis | OGL v3.0 | Population denominator per CSP (CSP boundaries align with LA districts) |
3. Formula
Step 1 — Raw rate per 1,000:
rate = (total_offences_2024_25 / ONS_mid2023_population) × 1,000
Step 2 — Min-max normalisation across all 310 CSPs:
GLCI = round(100 × (max_rate − rate) / (max_rate − min_rate))
Current bounds:
max_rate = 1055.3 / 1,000 (highest included CSP)
min_rate = 63.2 / 1,000 (lowest included CSP)
The bounds are recomputed annually when new Home Office CSP data is published. Because the GLCI is a relative ranking, the bounds change each year and GLCI scores from different years are not directly comparable — always cite the reference year.
4. Worked example — Bath and North East Somerset
| Police force | Avon and Somerset |
| Recorded offences (2024/25) | 27,822 |
| ONS mid-2023 population | 198,264 |
| Rate = offences / pop × 1,000 | 27,822 / 198,264 × 1,000 = 140.3 / 1,000 |
| GLCI = 100 × (1055.3 − 140.3) / (1055.3 − 63.2) | = 100 × 915.0 / 992.1= 92 / 100 |
| National rank | 134 of 310 |
These are the real published figures from the Home Office CSP dataset and ONS population estimates — no values have been invented or estimated.
5. Population crosswalk
CSP boundaries in England and Wales align closely with local authority district boundaries. Population denominators are taken from the ONS mid-2023 mid-year population estimates at the local authority district / unitary authority level (TYPE464 geography code, dataset NM_31_1 via Nomis). For CSPs that span multiple local authority boundaries following district mergers (for example, the 2020 Buckinghamshire UA merger or the 2023 Cumbrian authority restructure), the pre-merger district populations are used based on the boundary as at the time of reporting.
6. Exclusions
- Fraud — recorded centrally by Action Fraud / CIFAS / UK Finance, not allocated to a geographic force or CSP, so it cannot produce a meaningful per-area rate.
- British Transport Police — a national network force with no resident population; rates are not meaningful.
- 4 anomalous Kent CSPs — Maidstone, Medway, Tonbridge and Malling, and Tunbridge Wells show anomalously low offence counts inconsistent with the Kent police force area total, indicating incomplete CSP-level allocation. To avoid publishing misleading rates these four CSPs are excluded. The remaining 8 Kent CSPs are included.
- Manchester Airport CSP — included in the count of 310 CSPs but excluded from the national baseline calculation because its resident population (estimated at ~5,000) is dwarfed by its airside population, producing a rate that is not comparable with residential CSPs.
- Year-on-year trend — the Home Office changed counting rules for conduct crimes (stalking, harassment, coercive control) in May 2023 under the NDQIS programme. This makes 2024/25 figures non-comparable with 2023/24 for trend purposes. No trend percentage is therefore shown.
7. Update cadence
The Home Office publishes updated CSP crime tables quarterly, but the annual financial year (April–March) release is the most complete. GeraRent recomputes the GLCI annually following the Home Office annual CSP data release, typically published in April or July of the following year. The current GLCI is based on the 2024/25 full-year data published 23 April 2026.
8. Attribution and reproduction
The underlying source data (Home Office CSP tables, ONS population estimates) is © Crown copyright, licensed under the Open Government Licence v3.0. Anyone can reproduce the GLCI computation from the source data using the formula above. The name “Gera Local Crime Index” and the acronym “GLCI” are GeraRent-branded — please attribute GeraRent when citing a GLCI value.
Source URL: https://www.gov.uk/government/statistical-data-sets/police-recorded-crime-and-outcomes-open-data-tables
9. Key facts at a glance
| Reference period | financial year 2024/25 (April 2024 to March 2025) |
| CSPs included | 310 |
| Population-weighted baseline rate | 149.3 per 1,000 |
| Highest rate (GLCI = 0) | 1055.3 per 1,000 |
| Lowest rate (GLCI = 100) | 63.2 per 1,000 |
| Data published | 23 April 2026 |
| Next update expected | April / July 2027 (2025/26 annual release) |