Professional boxing is full of macho testosterone-fuelled posturing. It's hard to imagine a more challenging environment in which to be a woman trapped in a man's body. Stephen Sackur speaks to Kellie Maloney, who felt like that for many years. Until recent gender confirmation surgery, she was known as Frank Maloney, boxing promoter and twice-married father of three. Now that Frank has a very public new life as Kellie, how much has changed?