The Gnomes of Dulwich

Apart from being quite witty, the only other thing I recall is an episode which featured plastic Japanese gnomes that had moved into the garden.

I'm guessing here but I think that the script may have contained a lot of very racist dialogue. At the time it was not considered harmful or wrong by most people. Thankfully most of society has moved on.

That said, it is a shame that the tapes were wiped.

Perhaps the episode scripts are still available in the BBC archives. It would be interesting to read them.