Hi Jen... apart from Autotrader also try e-bay (obviously!) and pistonheads.com - large amount for sale usually HOWEVER as in all things not all the for sale ones are good!!! There is a young lady on here that's selling her red 56 XF with low miles and the price has been reduced to something a little more realistic. What condition it's in I have no idea but from the pics it did look good (as it should for 20,000 miles!!). Look for it about 2/3 months ago on the UK section of the forum.

Oh and be prepared to travel for a good one!!!