IMO it depends how much damage. If it was just a rear ender, then surely a new bumper, crash beam, lights and possibly straighten the rear 1/4's and boot would fix it. Far far from £7000.
I'd get a list of what needs done because for £6k you could fix it, put a set of 19's, full bodykit, respray, exhaust and still have change left over for an UpRev and other NA mods.