I've forgotten the name of a book - I'm not sure if this is where I should be asking if anyone knows the book name?

Basically it's a body and gender swap novel. From memory the female wanted to be male and was acting out with her/his parents. The male who is the MC had no known gender issues. They met while on family holidays and there was some sort of accident that meant they swapped bodies. Because the families lived in different parts of the country the plan was for them to go and live with the others parents.