Nice looking bike. A friend has one in that funny brown colour, and it’s well nice.
Time it’s taken me to type this you have 2 good answers already!
Problem is that although the Trek warranty is pretty good, unlike cars but like all bicycles (with the exception of one or two really unusual/expensive ones) the warranty is not transferrable to a new owner. Receipts are good though as they assure the buyer it’s not stolen! 😆 For the warranty reason you will be waiting a long time for anyone to buy it for more than 2/3 of what you can buy it for new at then moment. (if it is last years, chances are you will be able to buy a new 2011 one with a warranty for 20% off rrp or thereabouts.
If you want to try your luck, ebay it because there may be 2 or three bidders that get carried away, and be prepared for 15% of what you sell it for going back to them in ebay and paypal fees.
Otherwise, put it on the classifieds with plenty of photos, tell people roughly where you live so they can come and see it, ask for £1300 and it will sell for £1200 soon enough.