Cheapest I can find any for is 7k and they're a bit ropey - one had 5+ owners and a slightly dodgy MOT history whereas mine has only had 1 before me and the MOT history is perfect, not a single advisory on any test. I don't seem to be able to buy anything comparable for under 7.5k so I don't think asking for more money is unreasonable. I've put the case to them with a bunch of links so I'll expect to get told to jog on soon
I do at least have a courtesy car at the moment, yes, so that's something but I imagine they'll be wanting that back very soon indeed.