Last I heard anything about Next To Normal in London was a thread that was talking about if the show would work there, let alone any talks of a transfer.
And, I am sure that there are some cast members of Hair who are thinking long and hard about going to London. Keep in mind, that if they go there and do the show there, they are screwed when they come home. I know that some of them are parents and have kids. It would make sense that some of them wouldn't want to go over there only to have job security. If they stay on Broadway, then there is a surefire chance that they would have a job. Not so when they are done with their gig in London. Yeah, it sounds cool on paper and in terms of ticket sales. But, it's not something that sounds good realistically.
"If you try to shag my husband while I am still alive, I will shove the art of motorcycle maintenance up your rancid little Cu**. That's a good dear"
Tom Stoppard's Rock N Roll