This used to be regarded as a visa violation a few years back, and the 'fiancee' was sent back kicking and screaming back to the Phil to apply for the correct visa, as you have actually lied when applying for the visitor visa, as you already had an 'intention' to marry.
They do however look at each case these days, and as the HO has not given you permission to marry you need to apply for a certificate of approval from them. http://www.ind.homeoffice.gov.uk/app...ingcivilpartne
