What did it cost you? What does something similar sell for on Gumtree or Ebay ?
Have you checked the prices offered by CEX (www.webuy.com) - I hastily add that they are very clearly a business as the final price will be fairly close to a brand new cost, while they will offer you perhaps 2/3 (a guess, I've not analysed their figures scientifically, but based on a few phone prices I've seen).
Thanks NetworkGuy. I can't remember how much it cost but it was brand new from Amazon. I'll have a look at CEX. I'm not technical and wouldn't know how to wipe it clean to make it ready to re-sell - was wondering whether Apple or similar offers a trade-in service so that is done by them.