Hi Anna
Welcome to the forum. I see that you reside in Stamford, I often go there myself, it's a lovely town!
For those intending to live together without the intention to marry, there is something called a Co-habitation Agreement which I understand is the same sort of principle as a pre-nuptual agreement. I haven't researched this properly myself yet but was informed about it by a solicitor. In view of your circumstances, you or your boyfriend might wish to obtain more information about it since having one in place might add substance to your visa application.
Good luck with your application.
