is it a kind of dream?

Good review:
http://www.thisislondon.co.uk/theatre/review-23408749-details/Long+day's+journey+into+England's+nightmare/review.do?reviewId=23408749

Bad review:
http://blogs.warwick.ac.uk/pkirwan/entry/henry_iv_part_1/

Okay review: (says pt1 not so good, pt 2 better)
http://arts.guardian.co.uk/theatre/drama/reviews/story/0,,2151339,00.html

A blog entry about the night of the stand-in:
http://robhardy.blogspot.com/

Not sure this review is committal either way:
http://www.whatsonstage.com/index.php?pg=207&story=E8821187339950

And another i'm not sure about:
http://blogs.warwick.ac.uk/pkirwan/entry/henry_iv_part_1_2/

That's about all i can find right now.