Aye. Reason I was asking about whether I had to be there was if I don't, we could always apply just before I leave which means we'd have until January 10th or thereabouts to get married. As we are planning on New Year's Day, that should see us.
As it stands though, I've just done the numbers, and I just miss out on having enough time to get the certificate from the UK before I leave. On the off-chance it's slightly less time in the IOM, I'm trying to get hold of the registrar here to check. Not holding my breath though!