As mentioned to Kate.N we could do with some car passes to display in volunteers and traders cars only those parking in the grounds just in case they need to be moved in an emergency , if you like I can do these.
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I have just written this on my list for next year too Steve! So if we are going to do them so that we can identify exactly who owns each vehicle they will have to be paper or card so that names and phone numbers and where abouts in the grounds (Exhibitors tent, Imager, Observer, LTC) the owner will be can be written on it - is that what you have in mind?