Summary
UK House Price Index, Price Paid Data and House Price Statistics for Small Areas answer different questions. UK HPI is best for price trends and time adjustment. Price Paid Data is best for individual completed sale evidence in England and Wales. HPSSA is best for small area summary statistics built from transaction records.
Definition
UK House Price Index is the official monthly index that tracks house price changes across the UK and can be used to adjust older comparable sales to a current valuation month. HM Land Registry Price Paid Data is an open transaction level dataset of residential sales in England and Wales, useful for finding individual comparable sales. House Price Statistics for Small Areas are ONS summary statistics for housing transactions by small areas and property type, using HM Land Registry Price Paid Data. Use UK HPI for movement over time, Price Paid Data for actual comparable transactions, and HPSSA for area level summaries where individual transactions are too noisy.