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The wedding of Prince Charles and Lady Diana Spencer at St Paul's Cathedral in London, 29th July 1981. The bride arrives on the arm of her father, John Spencer, 8th Earl Spencer. Amongst the wedding guests pictured are Prime Minister Margaret Thatcher with her husband Denis Thatcher and politicians William Whitelaw, Michael Heseltine and Leon Brittan. (Photo by Serge Lemoine/Hulton Archive/Getty Images)

The wedding of Prince Charles and Lady Diana Spencer at St Paul's Cathedral in London, 29th July 1981. The bride arrives on the arm of her father, John Spencer, 8th Earl Spencer. Amongst the wedding guests pictured are Prime Minister Margaret Thatcher with her husband Denis Thatcher and politicians William Whitelaw, Michael Heseltine and Leon Brittan. (Photo by Serge Lemoine/Hulton Archive/Getty Images)