I've just found the interview with Richard Fish (Bill)
http://www.weasleynetwork.org/weasley/richardfish.shtml in which he says:
Quote:
After they learned I was keen to return to hopefully make Bill have a larger prescence, they confirmed that they were interested in re hiring me for the job.
So Bill in GoF, but no Charlie? It doesn't appear to make any sense.
I hope this isn't another Kloves cock up. Charlie = dragons not Bill!