Hi lordna
I have been to the PI last year afterI re acquire my Phil. Citizenship. I do have a Phil epassport as well as my 2 British daughters.
It will save you a lot of time effort and money if you re acquire and apply for a passport at the same time.
If in the future you decided to stay longer than 1 year in the PI as far as I know it is better to enter in a Phil passport.
If you don't get a passport now in the future if you apply for one they do charge 18 pounds for late renewals - info that they don't tell you as my friend did the same thing.
Going to the Embassy in London will take a lot of your time
effort and money....why not do it all at the same time? There is no harm in doing so.