Hi Chris,
Welcome to the forum
Lanie and I got married in January
Here's how we achieved this in 4 weeks
Dec 21 – arrive Manila
Dec 27 – go to Embassy for local CONI ( you must get one in the UK first ) – pick up same day
Dec 28 – Fly to Mindanao
Jan 3 – Visit Mayor to ask him to marry us
Jan 4-6 – Arrange reception , cake , Lechon etc
Jan 7 – Marriage and reception
Jan 8 – Pick up Marriage certificate
Jan 9 – Return to Manila
Jan 10 – Pay 45000P to get Managers cheque from bank
Jan 11 – Submit application to UK visa centre
Jan 15 – Return to UK
You can ask the mayor ( as we did ) to waiver the 10 days between the issue of the wedding licence and the actual ceremony
Not sure what part of Mindanao your gf is from but we got married in Alaron.
Also we managed to get our marriage certificate next day after the ceremony
Good luck !!