Graham Dukes' book worked for me. And also, as other people have said, visits are invaluable. I guess it kind of makes the books make sense, if you get what i mean?!!?
I don't know how true this is, but i don't think they are allowed to ask too many technical questions these days. It seems to have moved more towards group exercises.
If you decide you'd like to go further a field and try Swanwick for a visit, feel free to PM me and i'l gve you a number. Manchester are a great bunch though.
Very best of luck with the interviews.