Greetings Russ,
Enjoy the trip and for sure the water will be warmer than Bull Bay ... !!
On landing in NAIA I normally make use of the ATM machine which you can find if wandering left when coming out of arrivals. Depends what UK ATM bank card you have, but LloydsTSB and HSBC UK cards have always worked in Philippines for me, and of course prices in Philippines remain far far cheaper than UK, so a couple of hundred quid converted to Peso will still last you a long time for food and drinks.
Of course not all places have ATM's (eg: MoalBoal), so just make sure you've enough cash, and not relying just on ATM's.
Enjoy ~ and don't miss Rhyl too much !
Cheers.