Dennis,
Just two tips:
First, there is food on offer, but it never looks particularly appetising to me, and finding a table can be hard at lunchtime. Either bring something (you can leave it in the car and get a passout when hungry), or buy a sandwich at the Sainsbury's supermarket you pass at the start of the long driveway down to the Showground
Secondly, if you stay until the end, you may find the lemming-like rush to leave leads to a long wait caused by the traffic lights next to Sainsbury's. Either leave a bit earlier, or be prepared to take one of the back ways out of the Showground - if you are meeting up with the lads at noon, I'm sure one of them will point you in the right direction. If I'm there. I will.
Andy