The actor Michael Sheen was cast away by Lauren Laverne in 2025.
He has portrayed many real people on stage including Tony Blair, Brian Clough and David Frost, though never Jack Nicholson. That was his father's department, who had a second career impersonating the actor, which started around the time Nicholson played the Joker in the 1989 Batman film.
You can listen to the full episode on BBC Sounds.