I recently posted about how it was impossible to access the iTunes Store if you were in one of the Channel Islands such as Guernsey or Jersey. Specifically, when you were updating your account details, it used to be possible to enter your postcode in lower case, or, enter a valid e.g., UK mainland postcode to get around it. This stopped working and all workarounds were essentially dead – the only explanation was that iTunes now uses some geographic IP address matching to check you were physically where you say you were. So it seemed like there was no way around it.
However, I’ve found a way around it.