When Steve Coogan first emerged three decades ago playing different characters he was often compared to Peter Sellers. Someone whose real personality was unknowable but who came alive when he inhabited someone else. Coogan has now taken the audacious step of making that comparison more explicit than ever, taking on not one but three roles Sellers famously played in the Stanley Kubrick 1964 satire Dr Strangelove (plus a fourth that Sellers didn’t play, but was intended for him).