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I think that might be a sticking point. The barn could be updated and serve a perfectly legitimate use for the farm - only as long as they have it they won't use it as barn, but that would be I suppose the primary function of it. They aren't farmers and the plot would be a great place for a home, but I suppose as a farm, farm purpose might come first. I think a bit of knowledge is necessary as getting these consents are often expensive! It'd be nice to know if there was any chance of success :)