There was mega cost and wage inflation in the 1970's up to c.1981, for everything in general, due to various crises and slumps in the UK and elsewhere. So the rise in house prices then, was far less in real terms. Similarly in the late 1980's under the Nigel Lawson boom.
£43,000, also in 1987, for a smallish one bedroom flat in Kamptown, Brighton. At the time, larger flats in the area were going for £55,000.
Followed by the house price slump of 1990 to 1994 with millions in negative equity and/or repossessed.