Glad to learn you got those annulment papers
Well done for completing that key step
About getting married in Philippines as British Citizen, here's some important information from the British Embassy about Marriage in The Philippines
And here is some general information about Getting married abroad
Generally, with good organisation, and when things go fairly smooth along the way, you should be OK in getting married within a 3-week time frame.
Always check locally for the latest information on the paperwork needed for issue of the Marriage License.
Ideally you should consider having the following:-
Your birth certificate
Your passport
Your British Embassy issued affidavit
Your NSO CENOMAR (if needed)
Your Divorce decree asbsolute (if applicable)
Certificate of 'Pre-Marriage Seminar' (if needed, please check well beforehand)
Her N.S.O. birth certificate (This should be fresh from NSO on latest type of security paper. Check)
Her Passport (or other appropriate ID)
Her Barangay clearance (if needed, please check well beforehand)
Her community tax certificate (often called Cedula)
Her postal I.D. Address
Her cenomar
Her Parents signed advice form (if under 25 years age)
Her Parents I.D.
Apply for the Marriage License in your fiancée's home town at the registry office. (or locality of where marriage will take place)
You just might also be requested to attend the "Pre-Marriage Seminar" counselling sessions prior to being allowed to be married. Check and ask when you apply for the marriage license
After you apply for the license there is a mandatory 10 day waiting period while the marriage bans are published
Just be sure that you have authorised copies of the Marriage Certificate after the wedding or that you request fast-tracking /Expediting for NSO copies. Quite a few folks get into a long waiting time for the marriage certificate needed for a visa application so worth thinking about
Take a look at this thread for information on fastracking the marriage certificate - Advance Endorsement Birth ,Marriage and Death Certificate