He certainly was.A great list - The Ipcress File probably belonged in mine as did the dummy episode in Dead of Night whilst And Soon the Darkness is greatly under-rated.
But especially Green for Danger - indeed I could easily have included almost everything with Alistair Sim a great presence in film after film.
John Mills was also another great who was in countless class films. I enjoyed The Long Memory which had a scene where he tracked down the villain of the piece in his hideout in Shad Thames.
He also played a German spy in Cottage to Let, a wartime thriller featuring a fourteen year old protege of Alistair Sim in his first screen role called George Cole. George played a teenage version of Flash Harry/Arthur Daley!