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It’s two walls. They meet at my border. The road curves around and so do the rear gardens. If the tree wasn’t there I’d have a straight line. Further complicated by the tree that has grown a root through the gap between walls and is pushing them apart. I cut the root back in the summer.
Council are on it but not in a hurry. I think the tree has to come down. Which is a shame and I’m hoping to avoid.
Why are people concerned about it? It’s not going to fall down and I’m not going to see it.
I can't see any broken bricks across the gap, (even at 500% Zoom in Firefox).
It may well be a day joint or an expansion joint.
Properly specified brickwork has functional joints to allow for thermal expansion. Have a look on the other side to see it either bit of wall starts/ends in a pillar/parapet for additional stability.
Is it the photo, or does the wall change angle at the joint?