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lynx
There was an issue with the roof on the tenement that I previously lived in. It took several years and several contractors before we found one that could solve it. What was needed practically was to pour water on the roof (or wait until it was raining) and then look in various places in the roof space with an endoscope to watch the water entering and moving laterally before heading into the upper flat.
Plenty of people can spot An issue from a photo, but is it The issue? Water ingress is a tricky thing and in my experience it takes a lot more than a single photo to diagnose. So I would say be wary, get other quotes/opinions and hopefully someone will be able to figure it out.
Also, does this shed any light on the clubscew wall term? https://underoneroof.scot/skews/
I would assume that coppen means coping as others have suggested.