I do actually understand what is your point and you are quite right..
The Embassy shouldn't strict the option to allow your gf/bf in the Phils to have a visit visa first and this gives them a chance to see what is their future going to be look like here
but for the embassy, If you have a relationship with a filipina you should get her fiance than visit visa or if you don't want to marry your gf yet then I guess the embassy wants the britons to do the hard work travelling 20+ hours just to be with their love ones.