I've been reading through all your comments about Nancy's age and it's made me look up more about the original Nancy, who was 17 years (as you've said) and had been prostituted by Fagin since she was 6. I think that now that I wouldn't want a Nancy as womanly as in the film Oliver! I'd much rather she seemed younger, a girl who is vulnerable and has been damaged but is a survivor; a girl who struggles with doing the right thing because she needs Bill to love her.
Like some of you have said, it's all about the acting, and I wish we could see more of their acting so we can judge better who to vote for. I thought that with Maria and Joseph too, but it's even more important here.
And I agree that I wish we could know who Bill Sykes is to be- or at leas the age they're going for. I really like Niamh, for instance, at the moment, but if he's too much older than his Nancy it might not be so good. What does anyone else think?