iPhone 4s 16gb black o2 1 week old - boxed! +

Got this phone last monday (got receipt!) as an upgrade on my O2 contract (so the phone is locked to 02) but really quite happy with my old android phone so selling the iPhone 4s. Comes fully boxed/ original headphones/ charger still wrapped etc. Collection from B48 or B13. 350 or near offer please.