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By Andrew Osborn LONDON (Reuters) - Ukrainian-born billionaire Len Blavatnik has become Britain's wealthiest man, a "rich list" published annually by The Sunday Times newspaper showed on Sunday, but the Queen slipped down the rankings despite her net worth growing. Boosted largely by rising stock markets, the newspaper said the super-rich had doubled their collective wealth since the 2009 economic crisis and that the wealthiest 1,000 people based in Britain were now worth 547 billion pounds, up from 258 billion in 2009, an increase of 112 percent. The Labour Party accuses Prime Minister David Cameron of governing in favour of the wealthy at the expense of the poor. Britain has 117 sterling billionaires, the list showed, more than any other country except the United States and China, and London has more billionaires (80) than ever before and more than any other city in the world.