Robert Brown (53) believes that he could be the love child of Princess Margaret, who died in 2002 aged 71, and Group Captain Peter Townsend, who had an ill-fated romance with the Princess.
If Mr Brown is found to be their sibling, he would become 12th in line to the throne.
But his attempts to find out the contents of the Queen’s sister’s will and that of the Queen Mother have so far been blocked by judges who say orders to seal the documents should remain in force.
