More Hurricanes required
Instead of BAE laying off staff and closing production lines down they might just aswell lay down a line of 100 Hurricanes (with possible Merlin substitutes) and flog them to rich bankers. They could then move a couple of dozen down to Kenley and make a proper film about the BoB.(in the correct area).
When they have finished that they can then move them off to France and record the exploits of the AASF and BEF Squadrons in an earlier skirmish.(no Spitfires required there)
Of course the FAA would then no doubt want to use one of their (now defunt carriers) to make an excellent film of how the type provided them with their first 8 gun fighter with a half decent performance.
In fact with all these films that could be made that included fighter bombers, Rockets, Four Cannon use,Tank busting, night fighting, and being shot off merchant ships they might aswell build 300.B.....r the CGI