As a local I remember the uproar in the local paper last year about the appalling traffic arrangements and jams getting in and out, and an undertaking from the organisers (Air Displays International - remember it's not the airfield that organises the show) that the same mistakes would not be repeated. Sounds like the lessons were not learned.
Having said that, I'm quite surprised to hear people turning up at midday or even 2pm. It's an all day event why not be there all day?