I can wait longer
I am not sure if this answer already went, the web site crashed partway through. We cannot marry in the UK because the registry office will not issue a marriage licence. Before they will issue a licence, they need to see an approved copy of the marriage annulment, i.e. a copy of the original marriage register endorsed with the annulment. This is not available because the Solicitor-General of the Philippines has not authorised it yet. He is not authorising any annulments because of an inquiry into possible abuses of the law in some provinces, his office is examining each court-approved annulment request in detail causing months of delays (he is also someone of known strict Catholic views, who disapproves of annulment in principle). Our attorney in the Philippines says that there is no legal mechanism to appeal against the delay in issuing the authorisation to endorse the marriage register. My fiancée's visa was granted on the basis of the court judgement (the strict wording of the grounds for UK visa approval is 'proof of any previous relationships having broken down' not 'free to marry') and at that time we had been told that the Solicitor-General's office would process the authorisation in a matter of weeks and that the court documents would probably be enough for the UK registrar.
I looked at form FLR(O) before but it said that it should not be used for application to remain as a partner, I am concerned that if we took this route then it might affect my fiancée's status if we did receive the necessary documents from the Philippines