An immaculate gent of sober appearance and cultivated presence, Bate was seemingly destined to play spymasters and senior civil servants. Lean, pale-eyed and of deceptively mild intonation, he was capable of unnervingly icy composure, never more effectively displayed than as the chameleon-like Soviet mole Kim Philby in ITV's telemovie Philby, Burgess and Maclean (1977).