If you click on "contact us" from the link I posted and just ask for a registration form. (they are very friendly)
I have been before, although this is my first time showing a car.
Answering your other questions there is also a standard declaration, I contacted my insurance and they were fine with it.
:"I confirm, during the period of the event, my entry will be covered by a suitable insurance policy (such as a specialist collectors insurance) which includes public liability, display or rally usage" "Please send your completed Registration Form along with entry fee of £3.50 made payable to: The Rotary Club of Senlac along with a 9x6 (A5 size) Stamped, self addressed envelope, to:"Hope that helps.

Hi, have you attended before? Is there any sort of fee / registration / insurance requirement, or do you just turn up on the day?