"You travel alone because other people are only there to remind you how much that hook hurts that we all bit down on. Wait for that one day we can bite free and get back out there in space where we belong, sail back over water, over skies, into space, the hook finally out of our mouths and we wander back out there in space spawning to other planets never to return hurrah to earth and we'll look back and can't even see these lives here anymore. Only the taste of blood to remind us we ever existed. The earth is small. We're gone. We're dead. We're safe."
-John Guare, Landscape of the Body
The latest news is that the film is based on the comic strip, not the musical, and therefore is an all-new project. Jay-Z is composing new music. I would presume Emma Thompson is not so much rewriting the book as adapting a new screenplay from the extant source material.
"There is no problem so big that it cannot be run away from."
~ Charles M. Schulz
I appreciate that example, best12. Ang Lee would also not have been the expected choice for Brokeback Mountain or The Ice Storm either, two very American stories, but he aced them. Carol Reed, William Wyler and George Cukor weren't musical showmen, far from it, but they did pretty well with Oliver, Funny Girl and My Fair Lady. Anyone who's read Breakfast at Tiffany's would not have thought of Audrey Hepburn as Holly Golightly, but she made the film a classic. And as an example of off-brand screenwriting, Ingmar Bergman's name isn't the first you'd think of when it comes to sophisticated comedy, but there is no greater example of one in movie history than Smiles of a Summer Night.
I was assuming you meant Howard's End would be too complicated or something for Roseanne, and was trying to see how your analogy was apt.
But since you apparently meant British as opposed to Roseanne's American-ness, I would point you to the long history of British literature featuring beleagured orphans tortured by comically cruel adults.