.... your comments & thoughts are ALWAYS appreciated, but on this one I think you should bow out gracefully
and leave it to the people who've ACTUALLY gone down the Fiancee route.
Yes, you are correct... the application form does say "will require to provide EVIDENCE of their intention to marry",
but this is a misnomer.
It is a Catch-22 situation..... you cannot do anything OFFICIAL until your lady arrives here.
Yes, you could book a hall, pre-book the Archbishop of Canterbury, order a cake, arrange to get your hair cut, etc etc .....
BUT all these things can be cancelled, or even better, set up by you on your John Bull printing set !
So, the "evidence" is not worth the paper it's written (or printed) on.
It's the total strength of your full application that will decide on the visa, not on the £8 per head or £50 per head
wedding breakfast menu !