There are stalls. Various this and thats.
It is a car park, you can walk around the field and that. I've never really heard the police moan and to be honest, any advice on riding is useful, it is just up to you whether you choose to use it or not (and if you choose to not, it probably makes you consider the way you do ride and why it is better than what is suggested)
I'm only going as it's a good excuse for a ride
