@Stuart ********
actually if you get your extension before your passport expires, the extension will only be valid until the passport expires. You get it transferred to your new passport, but then you have to apply for your year extension again, as it does not automatically extend out to the full year on your new passport. To get the full year, and not have to apply again in the same year, it is best to get a new passport first. It saves having to apply for your year's extension twice in the same year