Here's the latest information from the British Embassy
And here is some general information about Getting married abroad
There's a new system to book an appointment at the British Embassy Consular Section in Manila which should be done through the Clickbook Consular Appointment site.
See this link for details of Online appointment system for Consular services
In connection with marriage I suggest you always check the latest information for paperwork needed etc but in principle to apply for the Marriage License you should consider having the following:-
Your birth certificate
Your passport
Your C.N.I.
Your NSO CENOMAR
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.
Quite a few folks get into a long waiting time for the marriage certificate needed for a visa application. Take a look at this thread for information on fastracking the marriage certificate - Advance Endorsement Birth ,Marriage and Death Certificate