Thanks for all your replies.

I'll be obtaining a UK issued CNI before I travel to the Philippines, so with my appointment at the embassy booked I should be able to obtain the local CNI when presenting all the relevant documents. I believe the turn-around time to obtain the local CNI in this case should be no more than one working day.

The threads I have read through regarding how to obtain a marriage license suggest I'll also need to obtain a CENOMAR from the NSO, which my fiancee should be able to obtain for me before I travel to the Philippines.

I understand that both my fiancee and I must be present when applying for the marriage license, but at the moment I'm still not sure on whether once we have completed the paperwork and must wait for 10 days until the license is issued, whether I'm allowed to fly back to the UK for a short period. There may well be varying local requirements on this depending on where we apply for the license, so I'll need to do a bit of research!

Chris