The role demo involves
x2 Tornado F3
x2 Tornado GR4
x2 Hawk T1
x1 E3-D Sentry
x1 Chinook HC2
x1 Apache AH1
I imagine its the finale where they demonstrate a 'bombing raid' along the beach but not sure on that.
Yup, there were queues last year. Don't know how long you'll be stuck in traffic (I took the train when I went)
Might be worth doing a park and ride?