Selling valuable council houses 'would harm communities'

London's councils should sell off their most expensive homes and reinvest the money in building cheaper social accommodation, according to the think-tank Policy Exchange.

There is an urgent need for more social housing in London as council tenant Moussa Kadri attests.

He has been waiting for a bigger council flat for seven years.

Karen Buck, Labour MP for Westminster North says: "Everything we know about communities says that it is important for them to be mixed."