I honestly don't think I can choose, I think of one and then recall another. First thing that I thought about was Top Cat.
The BBC drama that first comes to mind was Moondial. But again there were many others, The December Rose being one.
There was a game show too, which ended with the children who left having to cross a grid. They had to make it to the other side, if they didn't they fell through and were lost forever (ok maybe not really!). Can't recall the show's name though.