Been watching them too! Must admit I was quite mesmerised by Colin Baker's assistant! Yep Patrick Troughton was in Box of Delights, I got the dvd.
Remember when John Cleese turned up and said "It's a kid's show!" on the Goodies?! Yep the Goodies ...oh and he did a cameo in Dr who as well!
Oooh, I know this one, Tom's Midnight Garden :)