Steve, I don't think it's easy to document the costs of living. That would apply in Phils and also here in UK. We all have a different view of what we need to live and be happy.
This thread is a great idea, by the way.
We will not get to any defined costs but we will surely get an informative spread. (depending where and how you live)
Some ex-pats I know live very cheaply, especially in the provinces with no A/C and no western style foods and hardly any travelling around.
Others demand a western style house with all mod cons, A/C blasting, plenty of imported foods or eating out etc.
Probably best to start with your own individual minimum amount of cost to live here in UK and say, can I live on that in Phils on a like for like.