My idea is to place some trestles on the wall and add some climber types of plants.

Might have a spot of bother with neighbour if you actually 'fix' to the wall :-))

A good number of years ago, I came to an agreement with my neighbour over the fence at the side of my house. I had two external Chimney Breasts and a fence outside of those. The fence was serving no useful purpose and I suggested to my neighbour that if I removed it, it would give him some extra width for his drive way to his garage at the rear of the buildings. We both had Jaguar cars and we were very conscious of the need to 'drive past obstructions with care' and it would help him out.

I recently heard, that the new people in what was my house, have taken it to Solicitor level to get the 'boundary' established and re-instated to how it was some 40 years ago!!!

Mike