With respect Olaf, there are many without MV's that attend the show, They pay For Public Camping, If everyone did the same as you do then there would not be many MV's at the show..
Transport, Fuel & tolls to get kit to the show this year Was well over £500
As said before it costs people many ££££ to attend the show, I know people in the UK that have MV's that would like to attend but can't afford it but they don't go marking there Civy vehicles up..
The organisers are to blame for not stamping this out from the start, the answer is unless you can prove that your vehicle is a genuine UN, Military Police etc vehicle they should not be allowed on the exhibitor field & should be charged to go in the public camping area..