As far as I can make out, essentially none of them have genuine military backgrounds, and none are capable of operating service aircraft; so their hobby seems to consist of wearing uniforms, ranks, decorations, etc., to which they are not entitled, and having their photos taken in airplanes that they know nothing about.
That sounds like a good definition of an actor then.
I was quite impressed by them , as far as I could tell, all their props were period pieces and the whole set-up looked very convincing.
If you want to be pedantic, the revetment where the Hurri was parked is post war and the effect was spoiled by the shiny hangar in the background, but the whole effect was very good.
So I would give them credit, it was the first time I'd seen RAF equipment being worn, as opposed to being displayed in a museum. and it brought many old photos to life. There is a school of thought which says 'old aircraft should be flown, not shown statically', I suppose the same could be applied to old equipment and clothing too.
Edited afterthought
Now wouldn't it be fun to get some of the resident North Weald staff/pilots dressed up in period costume. I can think of some people who whose character would fit the costumes very well. Next year maybe..