Ashraf Marwan was an Egyptian-born businessman, a son-in-law to Nasser and a political high-flyer in the administration of Sadat, who fell off the balcony of his flat in Carlton House Terrace, central London, in June 2007. His death was watched with incredulity by business colleagues assembled in an office across the road, who recalled seeing two burly, possibly Middle-eastern figures framed in the tableau.