Mark,
When I was looking at CVRTs in a scrap yard I asked the guys about values. They said they were worth twice as much as stripped hulls as they are complete vehicles, due to the effort involved with stripping them down. I would expect it to be the same with this Cent, there may be £270/tonne of metal in it, but you might spent £150/tonne getting that metal into a condition which it can be sold. At £270/tonne it's getting on for what it's worth as a complete, restored and roadable vehicle. I wouldn't want to pay more than £4000 for it!
Chris