By Kelly Williams & Monica Charsley A reformed gangster who struck up a friendship with Charles Bronson revealed that he gained his respect after he beat up a sadistic “nonce”. Stephen Gillen, who operated in London’s East End criminal underworld for 30 years, was banged up in a Category A jail with the notorious criminal. The pair, who first met in HMP Wandsworth, “connected as soldiers might in the trenches.” They strengthened their bond in HMP Wakefield after Stephen brutally attacked a paedophile when staff turned a blind eye in the yard. Bronson applauded him after he beat up the sex offe…