I have never seen it, but I have read a number of articles about it. While there are many films by Ken Russell I have not seen, this is one of them I'd most like to see. If for no other reason, everytime I think of Wordsworth's poetry, I hear the voice of David Warner, who played Wordsworth in the film.
Unfortunately, it does not appeared to have been released on dvd, nor do I know of any plans to release it in the future on dvd.