I've answered my own question, found and submitted the necessary form to O2. They say they will email me within 14 days, so i guess I can't guarantee its unlocked until I hear from them. Any offers, or shall I repost once its unlocked?
Any idea how much you want? pm me if you prefer Mrs P needs a new phone so I might be interested (although I suspect she'll continue refusing to see sense and still want a sony for some reason)
well that was quick! I've had a text from O2 saying that the phone is now unlocked. Unfortunately I haven't got a sim card that fits to test this out, but I assume they are correct.