I'm glad you were able to help your cousin out and she has someone to help her, + your husband if needed, being that someone British would be able to tell the easiest if someone is fake British!
It's also another good reason as to why to not have your personal pics on public settings on Facebook as someone can easily copy them and make up a fake profile. A Filipina friend of mine had a lot of her photos copied by someone else for a fake profile.
Did you report the fake propile to Facebook?
