I too remember this series from my London childhood in the '60s. I can still see John Laurie with his oh so distinctive face and voice sitting in his chair introducing each episode. There was one episode in particular that I recall. It was so creepy and so well done that at the climax my heart almost skipped a beat. It was the episode "The man who was Milligan" about a picture hanging on the wall of a London bedsit of a Chinaman rowing a boat across a lake. The man in the picture gets bigger and bigger until he eventually rows into the room and transports Milligan to a totally new life in Hong Kong. I saw that episode 60 years ago, yet it's indelibly engraved in my memory banks. And John Laurie too, along with it.