Hi there.
Firstly, Let me say, with no offence intended, that's not the best user name you could have come up with is it?

To answer you question.....If NSO has you on record as legally married, then you are 'legally' married. Period.
What you do about that is another issue. This forum will not provide information that is neither correct nor illegal.

Let me ask this.......if NSO state you are legally married according to their records but you discover that actually you are not legally married (in the Philippines) what do you believe you can do? This is a serious question so please don't think there's no point to it.

Did you (personally) follow all legal procedures ? (ie UK CNI exchanged for local .... marriage licence etc) ?

First step get hold of your record from NSO

BTW, yes, a UK divorce will require 5 years if the spouse will not agree.