Regarding Aintree Circuit, for your information there is a Liasion Officer who should be used for all Motorsport type approaches to the Racecourse Owners. His name is Mike Ashcroft and I can dig out his contact details, if you like.
My suggestion to go through Mike Ashcroft follows from the fact that Mike is still officially the Liasion Officer for Aintree, within the Association of North West Car Clubs. However, if you want to try another route, you could perhaps go through Liverpool Motor Club. I appreciate that I am telling you what to do, without knowing your contacts. However I have been on the edge of discussions for Aintree over the years, and think there is a need to present a common front to the Racecourse owners by all Motorsport type users.