Just to reiterate the point already made by Helimarshaller about the aircrew..you have to see it from our side of things, we see thousands of people during the weekend and they all look pretty much the same because they do not have the florescent yellow jackets on, so as aircrew, if you wish to walk airside then florescent yellow jackets are a must. They help us out so much because during the course of the weekend, hundreds of people stray across the blue ropes and into the airside area, and as one of the officials who have to deal with those people it is extremely hard work and extremely fustrating.
Most of the helicopter owners/pilots don't actually want people to be near to their helicopters, unless they are there to overlook and even then, some prefer not to have people looking too closely, and also there are quite a few people who don't understand that the lawns are active and will just walk behind the helicopters right into the active area, which as aircrew yourself, you can understand how dangerous that is.
Hence the reason for the blue rope.
So, if you do attend again, please ensure you have a high vis jacket to wear, as it helps us marshallers & safety officials a lot.