The latest Stage & Screen show has an interesting section on rejected film scores. As well as touching on the TROY debacle, they discuss at length William Walton's rejected score for the film "Battle of Britain" ... eventually replaced by Ron Goodwin (Where Eagles Dare).
A new DVD version of "Battle of Britain" has BOTH scores: the watcher can choose between the two. Maybe this will be done for TROY ... many years to come.
Anyway here is the link to the show. The discussion comes up about 30 minutes into the show.