I have been. There was one, maybe two stands selling guns, a fairly decent "Have a go clay pigeon layout" and a good similar three airgun "Have a go" stands.
The was a casting tuition stand and a lot, a lot, of stands for those interested in dogs. And good displays in the arenas...jousting, a scurry and etccl..
Would I go again? No. Do I regret going? Not at all. I enjoyed it as a one off. Being Sandringham and because of who owns the estate security was good.
No worries of things being stolen from your vehicle whilst you enjoyed the event.