Just an up date on this.
On 23.11.10 I sent £13,000, converted into Pesos, from Nationwide to BPI in Phil. It took four working days to arrive.
The Swift charge was £25 and the exchange rate was 69.378. The inter-bank rate on the day was hovering around 69.73. I don't think I would have done better any where else; unless of course you know differently !!!