UKDecides favours official datasets and primary polling publications wherever practical.
UK Parliament
UK Parliament Developer Hub provides supported public APIs covering members, interests, Commons and Lords votes, questions, bills, committees and other parliamentary data.
Electoral Commission
Electoral Commission Election Information API, delivered with Democracy Club, provides postcode-based information on upcoming elections, candidates and polling stations where available.
House of Commons Library
Commons Library Parliament and elections data provides election datasets and analysis, including constituency-level general election results and historic data.
ONS and official geography
Where UKDecides uses demographic or geographic statistics, we aim to identify the relevant Office for National Statistics dataset, geography and reference period.
Pollsters
Polling entries should link to the pollster’s own release or published tables where possible. Secondary reporting may be used for context but should not replace an available primary source.