Crazy idea, but why not go about introducing her the way you would any other girlfriend? If you start to draw distinctions between a girlfriend from the Philippines and one from the UK then you are no better than the people who assume all Filipinas are mail order

To me, the very fact you're so reluctant to announce your status suggests you are embarrassed by the situation. If I were you I'd think LONG and HARD about whether you really want this, or whether its just convenient for you right now. Because to me it doesn't sound like you're really committed to this girl, and that's unfair on her

Just my 2p