Saldous,

Frightening low trade-in value, but a BMW dealer won't want a 2nd hand XF on the lot.

Does your company not allow you to take cash as your car allowance and drive any car? I could have a company car (4 doors etc.) but I take the cash instead.

If you are going to lose that much you could get a much cheaper runaround and keep the XF as well.

I kept the Voyager for transporting the kids and for shopping in France. It has only done about 200 miles since April; the XF has nearly done 12,000 miles since April.
Good luck with your decision.