This is the event we have been going to for a couple of years now.
Full details are The Black Swan, Old Lane, Ockham, Surrey. KT11 1NG. Phone: 01932 862364. (Old Lane is a turning off the slip-road onto the Southbound A3 just after J10 of the M25). They open at 08.30 for breakfast, bacon rolls, tea and coffee so any time after that works fine.
We usually meet up at Ockham Bites (KT11 1NA) at the beginning of Old Lane around 08.00 for a coffee, bacon butty, etc. to avoid the potentially long catering queues at the Black Swan but we still always seem to end up in the field!
It's an outdoor event so if the weather is OK I plan to get to Ockham Bites at 08.00.