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The advice of teh UK Government to UK citizens on visiting the Philippines is set out below.
You can enter the Philippines without a visa for an initial period of 30 days. You can also get a tourist visa from the Philippine Embassybefore you travel, which will allow an initial 59 day stay.
You can apply to extend your stay at the offices of the Bureau of Immigration Overstaying without the proper authority is a serious matter and can lead to detention pending payment of outstanding fees and fines and voluntary deportation at your own expense.
If you intend to live, work, or study in the Philippines you’ll need to have certain UK documents (eg birth certificates, marriage certificates, UK police certificates, school documents) legalised by the FCO Legalisation Office and by the Philippine Embassy in London before relocating to the Philippines. These documents are required by the local authorities when applying for long-term resident visas. Contact the Legalisation Office and the Philippine Embassy in London.
For more information visit this link https://www.gov.uk/foreign-travel-advice/philippines/entry-requirements