As previously mentioned by joebloggs and taken from the British embassy website
A Consular Birth Registration is not a legal requirement , but it is recommended.
Births outside the Philippines will need to be forwarded to the relevant British Embassy post for registering.
The advantages are that
• A British style birth certificate is available as evidence of British nationality
• A record of the birth will afterwards be held in the General Registry Office in the United Kingdom. Further copies can be obtained from the General Registry Office
