There's plenty of conflicting information here on the forum too
It is an often discussed and often misunderstood subject for sure.
Plenty of people have their own interpretation about the rules and also about what can be done as a short cut.
Please do be informed that the official processes outlined and followed by both the UK and Philippines authorities are the ONLY formal and official guidance.
I would very strongly urge you to follow official process. Following any other route based on anecdotal evidence is taken totally at your own risk. Personally I think these kinds of issues are much too serious to take risks with.
Here is some useful official general information about overseas marriages and civil partnerships
and some CNI information here including the British Embassy appointment system and how to apply
The UK CNI is available from your local registry office. It takes 22 days from time of application. It's 21 days for the 'bans'.
You need to present this UK document to the British Embassy in the Philippines to be issued a Philippine version called a Certificate of Legal Capacity to Marry.
This certificate is needed for the application of a marriage license.
It has also now been reported that you will be required to obtain your own CENOMAR (Certificate of No Marriage) from NSO (National Statistics Office) so you would be well advised to include this contingency as well.