A midnight blue velvet wedding ensemble worn by Margaret Thatcher on her wedding day in 1951, expected to realise 10,000 - 15,000 GBP (13,800 - 20,700 euros), during a photocall at Christie's auction house in central London on December 11, 2015, to promote their forthcoming auction "Mrs Thatcher: Property from the Collection of the Right Honourable The Baroness Margaret Thatcher of Kesteven," which is set to take place on December 15.    AFP PHOTO / BEN STANSALL / AFP / BEN STANSALL        (Photo credit should read BEN STANSALL/AFP/Getty Images)