Hello jta
im also from cebu but now here in uk. I used to visit the british consular office in cebu. She is very strict. Wasnt able to meet her in person although i keep calling her for an appointments. But my case was my visa going here at that time.
What i did with ours my husband got his CNI here in then send it to me. I went to British Embassy Manila for changing it to legal capacity. You need to pay an amount i think it was 4k that was last year and a copy of your fiance's passport.
Godluck
ann