Hi Japonica,
I think that applying for a fiancee visa before you are free to marry is just a total waste of time and money. When a fiancee visa is issued it is on the basis that you will come to the UK and be married within 6 months. No ECO (Entry Clearance Officer) will issue a fiancee visa just on the strength of you or your lawyer saying that your annulment process is almost complete or will be complete in the very near future. That would make the success of the fiancee visa process, the purpose of which is to allow you to come to the UK and be married within 6 months, be dependant on the vagaries and quirks of the Philippine legal system. It know it may seem to you like just a technicality and a bit of a nuisance, but to an ECO in the British Embassy in Manila, it's a black or white issue with no grey areas in between. I'm sorry this is not the sort of advice you really want hear, but honestly, it's in your best interest to put this idea right out of your head.

Iain.