Of course you can't prove a future event. If you apply for a fiancee (i.e. marriage) visa, the embassy will want "evidence" that you intend to marry, namely a date/time/location for the marriage and a date/time/location for the reception. But there is no requirement for written confirmation of these...Originally Posted by remee_milano
If, after she comes to the UK, you should decide not to marry, then, unless there are strong extenuating circumstances, it's "so long and thanks for all the (dried) fish"...