We've pulled together some useful FAQ's for you below.
There is a Link cash machine at the Tavern at Castle Combe in the paddock. Otherwise the next nearest is at the services on the A350 at Chippenham.
There is no fuel available on-site. A Texaco garage is on the A420 (heading back towards Chippenham) just before you arrive at Allington. The next nearest is at the services on the A350 at Chippenham.