In light of the recent iPhone 4 thread of the 'perfect' handsets, here is the 5c for £105.99, also 'perfect' on pay as you go (no contract required).
You simply select the phone and the top up card you want. There is NO OBLIGATION to top up - it is NOT a contract. The phone is yours to do what you please.
I did buy an iPhone 4 described by O2 as 'perfect', and indeed it was, new screen and back panel, literally like it had never been used.
Therefore I can only assume these handsets are of the same quality, literally perfect out of the box, and a bargain at £106 all in. Might be locked to O2 though.
At the time of this thread, only pink, green and yellow are in stock. Get them while you can!