I've solved my problem now.
I hadn't been following the PDF mentioned by scottiphone, I had been using the How To notes alongside each step. They say the same things, but it turns out they don't include the step for setting up your iPhone for development.
Still got the error after going through the PDF very slowly (after reinstalling Xcode and getting rid of the original certificates), but it was just a case of following the advice all over the net to change the identifier (changed it in the Properties tab of the Target Info).
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