Bearing in mind that we are told we are around half a million homes short now, plus our population is rising significantly without any increase in birthrate (Hong Kong, Ukraine, asylum seekers, economic migrants) its fairly easy to see that lack of suitable housing is a huge issue. Many people refuse to consider living anywhere else but London, which is the least likely place where you could realistically build affordable housing (or indeed much housing at all). Too many people want to live in London and then cry foul when they find property and cost of living is too expensive. Some of the reasons for people wanting to live in London are public transport, events, nightlife, airports to anywhere in the world. Fewer attractions up north, poor public transport, lower wages, lower temperature BUT much more affordable housing and lower cost of a pint!
I genuinely do not understand where people expect additional house to be built anywhere near London. Perhaps someone can explain why moving somewhere more affordable is ruled out by many?