Jim,
All the best at the York Show and go for it!!! I too, like Keith, was bemused at the "other" business model of charging people a tenner in order to get them to "man the stand" free for a few hours while the "Boss" did More Important Things (? getting more tenners from more suckers in order for them to work gratis for him???)
Have a great weekend and a very successful one!!!
Laurie