(L-R front row) Sarah Brown talks with someone behind her as her husband former British prime minister Gordon Brown speaks with the wife of the Speaker of the House of Commons John Bercow, Sally Bercow, as former British prime minister Tony Blair listens to Deputy Labour leader Harriet Harman who is flanked by Britain's Deputy Prime Minister Nick Clegg as Chancellor of the Exchequer George Osborne sits behind with his wife Frances as they attend a service to deliver a loyal address to Britain's Queen Elizabeth II marking her Diamond Jubilee at Westminster Hall in London on March 20, 2012. The queen responded to members of parliament and peers following 'a humble address' to the sovereign from both the House of Lords and House of Commons in a tradition that dates back to the 16th century.