A guard of honour of Blackshirts attended the wedding at St Michael 's Church , Chester Square , London of Mr Ian Hope Dundas , Chief of Staff of the British Union of Fascists and Miss Pamela Ernestin Dorman , who is also a Fascist . Sir Oswald Mosley , leader of the British Union of Fascists , was best man at the ceremony . Mr Dundas is the son of the late Admiral Sir Charles Dundas of Inchgarbie House , South Queensferry , Scotland . The bride is a niece of the late Sir Ernest Shackleton , the Antarctic explorer . Photo shows ; The bride cutting the cake with a hatchet watched by Sir Oswald Mosley and the bridegroom . 19 December 1933