... the potential loophole (aside from that verbal agreement being worth the paper it isn't written on) is that the farmland *behind* the house isn't going to be touched (we believe, though we're going to look at the actual planning office copy of the proposal tomorrow), it's an existing barn plus parking area that they want to convert and it's along the road so it doesn't get blocked by the "no backfill" law, it's "in-fill".
That's true ...
The rest is as you say.