Is this your first trip...???
I think you may have to do a bit more research....
Or maybe I got it wrong......
Anyway...... Yes, marrying in the Phils is a hell of a lot cheaper, and I mean "cheap" compared to the UK.
And you will bring lots of happiness and pride to her family.
Search on the forum and you will find lots of other threads attesting the same.
Besides, if you marry there, you will be doing away with the fiancee visa and go straight to the spouse one.
One less expense.
Don't forget to fetch chocolate when you go....