Depending on how the server is picking up where you are from, some servers are set to read the regional settings in your computer, so you can change your regional setting in the control panel, however because lots of times people install with default installation and it is sometimes wrong, some servers actually check your IP address, the IP address since it is registered to your ISP therefore it is capable of getting the info that way if that is the case, you would need to change your IP address to a UK one and that would not be possible unless you spoofed it and that would be illegal.
Mike