Dave, meetings over 30 people are banned. I don’t see how James can reopen Chatham.
See this important guidance on the Government website.
https://www.gov.uk/guidance/meeting-people-from-outside-your-household-from-4-july
Has it been confirmed that the Kempton Park fair can go ahead?
I had read that exhibition centres used for events had to remain closed.
Unfortunately Chatham is not outdoor, unless James can use the car park area opposite the buildings.
What is he hoping to do about Military Odyssey?