New-build supply rates (new-build sales per 1,000 sales, trailing 3 years) for every UK postcode area and district since 1995, alongside each geography’s historical price response to supply (β). Read the βs as descriptive, not causal: robustness testing showed much of the apparent sensitivity reflects new-build premium decay and sale-mix composition rather than supply depressing existing-stock prices — rows with |t| < 2 are faded accordingly. These research tables are rebuilt quarterly, not on the monthly price pipe.