You have to ask yourself what changed in the UK mortgage market to create this increase in housing value. It comes down to a bank regulation change the government put in place in 1996. Banks were able to offer buy-to-let mortgages.
This has fundamentally distorted the housing market in the UK.
In London you also have another issue. Apparently 40% of new build apartments are bought and never lived in. They are used as an investment to hold money 'safely' primarily by foreign buyers.
[EDIT] Citation for "buy to leave" http://www.theguardian.com/business/2014/dec/04/property-inv... http://www.theguardian.com/commentisfree/2014/dec/08/islingt...
So you have a situation where the Banks leant like crazy inflating the housing market, the crash happened, the banks hardened their mortgage lending criteria, which forced most people into renting, enabling landlords to maximise returns and invest further in rental properties using buy to let mortgages that use rental income as part of the payment calculation.
It's one hell of a vicious circle.
From my point of view I have benefited, but I honestly cannot see my 11 year old daughter ever owning her own property.