Also...
https://selfhelp.carphonewarehouse.com/SelfHelp/request.do?view()=c{ede583e0-1fa9-11df-4872-f20203001e3d}
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There's a big difference between selling an "unlocked" phone and one that will lock to 1st SIM (which is what CPW's iPhones do).
Just do a bit of Googling if you don't believe me.
good point. Annoyingly CPW don't have a web chat.. good if someone can get the information direct from the horse's mouth