Introduce restrictions on foreign purchases of UK homes.

Despite what the property lobby claim, increasing the supply of houses will not reduce property prices in the SE. Extra supply simply increases the crisis by adding a population crisis on top of a housing crisis. The single biggest factor in the rise of house prices to their current incredible levels is the growth of a vast foreign buyer segment which has fatally distorted the market in the SE.

See this recent report on the issue by Civitas.
http://www.civitas.org.uk/press/PRshelter.html