pbr The Government has revoked the British passport of Russian spy Anna Chapman.br ppbr Chapman, 28, who was married to a British man and lived in London for several years, was expelled from the US in the biggest spy swap since the Cold War.br ppbr She was flown back to Moscow last week, but her American lawyer said she would like to return to Britain.br ppbr But a Whitehall source said Chapman has been handed a letter revoking her citizenship and her passport is no longer valid.br ppbr Officials revealed Home Secretary Theresa May was urgently considering the case last week. She has the power to deprive dual nationals of citizenship when to do so would be "conducive to the public good".br ppbr Chapman was one of ten Russian spies exchanged for four Western agents released by Moscow in a spy swap on the tarmac at Vienna airport with echoes of the Soviet era.