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Yeah, saying no could potentially just sour things between you and your neighbours (even if you have the right to say no). I would want to be accommodating, but not taken for a mug. Take photos the morning before anything goes up, just in case. Best case, you get pleasantly surprised and you wouldn't know they had been there. Worst case, they're on the hook for some remedial works (worst worst case they don't follow through on their written agreement to fix stuff, in which case you get to sit on your high horse over them and/or take them to small claims, which they will lose).
No previous dealings with neighbours so I’ll get something in writing. Good point about it being on them/the roofers.
I deal with scaffolders for work, hence my trepidation!