Many thanks to those who replied! It looks like the paperwork is a must, unfortunately. It wasn't the trip that was daunting, though it's such a long haul, it was having to get hold of that paperwork, but it seems I can't avoid it. So I think I'm better off going for the full reapplication, since I have to make the trip anyway to get it. If anyone can advise otherwise, I'd love to know what I need to do to be able to do it here without pain.
Alas, I have no benevolent relatives who will send on the paperwork for me!
Thanks again everyone!