Back at the National, now on the South Bank, his next turning point was Peter Hall's premiere staging of Harold Pinter's "Betrayal", an unexpectedly subtle performance — a production photograph shows him embracing Penelope Wilton with sensitive hands and long slim fingers (the touch of a master clock-maker). He is also one of the few actors to have mastered the harsh demands of the vast Olivier Theatre. As Simon Callow once said: “Gambon's ‘iron lungs and overwhelming charisma are able to command a sort of operatic full-throatedness which triumphs over hard walls and long distances.”