If you can get to Maidstone then there are sessions every second and fourth monday evening at The Greyhound, so you won't need to go over the hill to north Kent. Try this:
http://www.google.co.uk/maps?hl=en&q=greyhound&near=Maidstone&radius=0.0&latlng=51270180,523856,17413807905158331118&sa=X&oi=loc
John Barden