I don't know what sort of job or anything like that, but you're young and if it were me I'd snap up the opportunity so fast their heads would spin! Of course, that depends on Lee's job and his future with the current company also - wouldn't want to jeopardize that at all. But I say go for it. Doesn't mean you have to stay for the rest of your life. Just take the opportunity to learn about a different culture. Even though the English are probably the most similar to Americans as it gets, they are still different with a different history and culture.

There's a saying - not sure exactly how it goes - but it's something like "No old person ever said if they had to do it all over again they would stay home and watch TV more." This is a fantastic opportunity - Go for it!