PayPal Express Error : Missing value for County Missing value for Phone

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Missing value for County
Missing value for Phone

Trying to get Express Checkout working, all works fine passing transaction details to PayPal, however, I'm getting the above error message in the notification area when I return to the checkout page from the PayPal site, all other fields are filled in correctly.
Totally defeats the point of express checkout as the user still needs to go to address fields to add them then choose Guest or Register and so breaks the flow.

I thought it may be a sandbox issue but it is still doing it with the live server.

Any pointers greatly appreciated.

Thanks in advance.

EDIT: Tried it with no overrides. Same issue.