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Given the vendor paid 935 for it in 2020 I'd want a pretty convincing explanation as to why they are bailing on it now after having started the project.
At a guess, it's because 'prices are rising all the time' and because they secured planning permission for some changes, including a dormer roof extension that adds a sloped roof storey with three rooms and a bathroom:
These are sensitive and necessary changes and good consents. They probably just underestimated the cost. My earlier suspicion that it's something to do with the conservation area was most likely wide of the mark. I should have looked up the planning applications first.
Given the vendor paid 935 for it in 2020 I'd want a pretty convincing explanation as to why they are bailing on it now after having started the project.