Yep, alsmith is right.
I'll just add that you can use your UK licence for 90 days from date of arrival.
Also for your first Philippine licence you will need to present your certificate of residency (address where you live), have a bit of an interview at the local police station and get your forms signed up.
The medical and drug test is pretty standard and exactly as simple as alsmith says.
The Philippine licence is usually valid for three years which is then just renewable.
Lot's of people use a fixer, but personally that's not something I would do.
