If you are already married in the philippines with a british citizen then a spouse visa not FLR M is the visa for you.
Spouse visa is for partners (not from uk) or families of a british citizen or a settled person in the UK. FLR M (extension) is a permission to stay and remain in the in the UK as the partner of a british citizen or a person settled in the uk.
spouse: http://www.bia.homeoffice.gov.uk/vis...ly-outside-uk/
flr m: http://www.bia.homeoffice.gov.uk/vis...pplying-in-uk/