Indulging in fantasy casting

I think we've all done it - pondered which actors would be perfect in a film of the book-what-we-wrote. So here's mine! If you've read the book please tell me what you think, or if you can think of anybody better :)

PS, I don't have a film deal, this is just for fun.


Roberta: Rebecca Hall? She looks very much like "my" Roberta.





Philip: Benedict Cumberbatch? (Posh but down to earth at the same time, like Philip)





Jan: James McAvoy?




OR

Tom Hardy? (both have the sort of Jan-look I imagined when I was writing him, especially Tom, but I have a soft spot for James. I know, I know, who doesn't?)




And, finally, Dorothy: Rachel Weisz? (Just the right mix of vulnerability and strength that I think Dorothy has)





What do you reckon?