Ok I've been having a tinker with this for a little while and think I've got it pretty close. I've developed an Excel spreadsheet that provides an estimate of whether or not your car is Category A: definitely worth bringing, you'll do nicely out of it when the time comes to sell Category B: only worth bringing if you love the car and/or plan to keep it for a while Category C: not worth the aggro, you're better off selling it in the UK   *Disclaimers* - the estimates are