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George Galloway has officially entered the race to become London's next mayor.

The Respect Party leader, who lost his seat as Bradford West MP last month, outlined a range of policies designed to clamp down on what he described as the "social cleansing" of the city.

Speaking at the Ethical Society in Holborn, he said he would make the "housing crisis" his main priority.

He said house prices were driving people "further to the edge of London, literally and metaphorically".

Mr Galloway, 60, first announced his intention to run for mayor last month, pledging to "build a city that benefits everyone, not just those dripping in gold".

During Sunday evening's speech and question-and-answer session, Mr Galloway said he would compulsorily purchase residential properties left vacant for at least one year and he also pledged to tackle white-collar crime.

Mr Galloway described current mayor Boris Johnson as a "blond buffoon".

On 7 May, Mr Galloway lost the Bradford West seat he took from Labour, his former party, in a 2012 by-election.

The seat was won by Labour's Naz Shah by a majority of more than 11,000 following a bitter campaign.

The City Hall election will take place in May 2016 when Mr Johnson, who returned to the Commons at the general election, steps down after two terms.

On Saturday, Labour announced six candidates would fight it out to represent the party at the London mayoral elections. They are Dame Tessa Jowell, MPs Sadiq Khan, David Lammy, Diane Abbott and Gareth Thomas and journalist Christian Wolmar.