In reply to GStone:
Because it's PPE they take the view that once it's out of their control there are factors such as UV and temperature exposure, oil or acid contamination that could occur accidentally or maliciously and weaken the item without leaving an external mark. Cotswolds actually give you a print out with your receipt basically saying once it leaves the shop it's yours and non-returnable (unless faulty etc) and other shops take a similar line.
Interestingly, I think if the same item is sold by the same shop online they have to abide by the distance selling regulations and allow return and refund without reason.
To answer your real question though, Yes, there will probably be interest in it if you put it up for sale (in an appropriate post), especially with packaging and a dated sales receipt, though don't expect to get the full price. Alternatively you could consider the 'Outdoor Gear Exchange' group on Facebook.