It's only if you bought really cheap in the 90s that you make a killing, and even then.
Case: my ILs.
Bought house for £17,000 in 1990.
Can sell it for about £225,000 - ex HA in very poor condition BUT extremely good locale (Trinity/Inverleith),
Yet, believe it or not, this will not buy them a two-bed ground floor flat (they live with their grown, disabled son) in the same area (MIL arthritic, FIL severe diabetes and heart condition).
So there they stay!