Are you accounting for inflation, currency losses during that time. Arguably your neighbours made no money though I can see people want hold every price as true, there is a cost to housing, taxes and repairs. They havent done quite as well as they appear to have.
Instead of moaning the latest generation needs to recognise gratitude is more profitable, you arent being drafted into another war and you have the giant benefits of decades of investment. UK has its problems but its richer then ever before generally, just being born here is like being a lotto winner comparatively.
The currency devaluation is a problem, its likely going to get worse so I'd suggest anyone who wasnt alive when OCUK was first setup learn a bit of history because it helps you guess what happens next.
Maybe hold a little gold via any means would be a good proactive reaction. If the neighbours sold in 2004 and held in
British sovereign currency which is tax free till now they'd have easily cleared £2m. They'd not have had the house to live in so its arguable but the house price appreciation isnt as it appears is the main point.