Was there a production reason for the move?
I've just been rewatching the show for the first time in a long time and I've thought of two things that never crossed my mind before.
1) Was there a production reason for having Victor and Margaret move house in the opening episode of Series 2? You do hear of a lot of productions having to rebuild sets and things because they didn't think the show would be successful only for it to take off. Or was it so they could introduce the two new sets of neighbors?
2) Why did they have Patrick and Pippa move? I know obviously they wanted to get away from Victor but Margaret and Victor were round quite a lot to their new house. Normally in a TV show you would have a couple move if you were going to write the actors out.