i would advise that any documents needed for british embassy of your fiancee, to get them from nso in manila, my wife's documents from cagayan were not accepted and viewed upon as no more than forgeries,
this delayed things for us having to make 2 more visits to the embassy, our first visit they told us to book online again, after pleading for help, explaining the appointments are 2 month waiting list they were kind enough to acommodate us with an earlier appointment, luckily we were not in a rush as i did not need to return to uk, but was all the same stressful and inconvenient, the british embassy is very strict,
please make sure you have everything needed and correct