The lean in the garden wall seems to have been caused mostly by a Leyland Cypress tree removed in 2014. The tree made the wall lean over by 6 inches and also pushed the foundations sideways by around 8 inches. If we are going to have a straight wall there will be some stump removal needed because the tree is in the way.
It’s been a nightmare to try and organise the stump removal and work has stopped on the wall now. The tree folk are really busy after having been stuck at home earlier in the year and despite promises nobody seems to want to actually turn up to remove the stump. It is too close to frosts to start re-building the wall this year.