Following the link that Rayna provided for you, you'll find it states this:-

Recognition of Marriage of Filipino citizen

Filipino citizens marrying outside the Philippines have to file a Report of Marriage at the Philippine Embassy/Consulate nearest to their place of residence. The requirements are as follows:
•A. Completed Report of Marriage form (to be submitted in triplicate)
•B. Three 4.5 cm x 3.5 cm photos each of the applicant and spouse on white background taken within the last six months
•C. Original and three (3) clear copies of marriage certificate
•D. Three (3) clear copies each of the data page of the couples passports
•E. Notarial fee of GBP18.00 (Note: There is an additional fee of GBP18.00 if registration is done one year after the marriage)
You can download the needed form from the Phils Embassy website
Copies of the marriage cert may be obtained from the registry office
You should already have passport copies (I imagine)