"Battle of Britain" Film replicas

Here is an interesting question for you all. Exactly how many fibreglass replicas of Spitfires,Hurricanes and Buchons were built for the 1969 “Battle of Britain” film,how many still exist and where are they now?

Interestingly at the recent “War and Peace” show there was a fibreglass Hurricane. A placard beside it said it was a Hurricane replica “as used in the Battle of Britain film” ,implying it might be one of the film replicas. However it looked like a brand new replica to me rather than a 42 year old one!