In the words of Benjamin Franklin "In this world nothing can be said to be certain, except death and taxes."
Make no mistakes UK pensions ARE taxable in Philippines.
Unless you make special arrangements to take advantage of existing agreements between Philippines and UK, you could expect to be taxed twice.
If you are resident in the Philippines and you let HMRC know that your pension will be taxed in your country of residence, the tax in the UK will not be applied.
To do this you need make a claim for relief so that HMRC will authorise payment of your pension without deduction of tax.
You will need to obtain a TIN (Taxpayer Identification Number) from BIR and send this to HMRC as evidence that you will be subject to tax in Philippines.
Here's the trick; currently income from pensions are taxed at a rate of 0% in Philippines.
Long may that continue !!!!
Not all pensions can be included in the agreement, so be sure to take care to allocate your UK personal allowances correctly and minimise the tax burden.
Enjoy!