In reply to BRUCESTRAC:
He'll definitely get more than £250 for all of that on fleBay.
Tent extension, easily £150 by itself and another 300 for the tent, footprints and carpet.
If I were the OP, I'd stick it on UKCampsite, the Outwell selling page on Facebook and Outdoor Gear Exchange on Facebook. Unlikely to be around for long on a couple of those sites.