The terms we keep using.

Abbreviations that show up on every report — defined here so you don't have to guess.

CAGRCompound Annual Growth Rate

The steady per-year rate that would get you from a start value to an end value. 5-year CAGR on a postcode page means "if this postcode appreciated evenly every year over the last 5 years, what would the annual rate be?". More robust than year-on-year price because it smooths single-year spikes.

EPCEnergy Performance CertificateMHCLG (UK gov)

A government rating (A = best, G = worst) of how energy-efficient a property is. Required for every listing / rental in the UK. Scale: A ≥ 92, B 81–91, C 69–80, D 55–68, E 39–54, F 21–38, G ≤ 20.

IMDIndex of Multiple DeprivationMHCLG 2025

The UK government's official measure of relative deprivation. Combines 7 factors (income, employment, education, health, crime, housing, environment) into a single ranking across ~32,000 small areas (LSOAs). Decile 1 = most deprived 10%, decile 10 = least.

LSOALower layer Super Output AreaONS

A small geographic unit used for UK census / IMD / health stats. Each LSOA contains 1,000–3,000 people. A postcode typically sits inside one LSOA; bigger postcodes span 2–3.

NaFRA2National Flood Risk Assessment (2nd edition)Environment Agency

The Environment Agency's official flood risk map for England. Combines river, surface water, and coastal flood probability. Used on the Environment dimension to classify Low / Medium / High risk for a given postcode.

OfstedOffice for Standards in Education

The UK's school regulator. Every school gets one of four ratings: Outstanding / Good / Requires Improvement / Inadequate. The Schools dimension aggregates Ofsted ratings of schools within a 1.5 km radius of the postcode centroid.

OKLCH

A modern CSS color model (Lightness · Chroma · Hue) that's perceptually uniform — equal-lightness colors actually look equal-bright to your eye. All colors on this site are defined in OKLCH so light / dark mode rebalances cleanly.

PTALPublic Transport Accessibility LevelTfL

TfL's 0–6b scale measuring how well any London location is served by public transport. 6a+ = excellent (central London + hub stations). 0–1 = poor. Used on the Transport dimension as a raw input.

SPARQL

Query language for graph-structured data. The HM Land Registry publishes sales transactions via a public SPARQL endpoint; we use it to pull 5-year price history for every London postcode.

TfLTransport for London

The authority running London's tube, bus, overground, DLR, tram. The Transport dimension uses TfL's Journey Planner API for peak commute time + their StopPoint API for station density.