If you don't mind venturing a bit further south...
Sabotage in Milton keynes are running what they call a 'Super Hybrid'. Walkons in the morning ramping is allowed (either 12 or 15bps I think) and then mixing it up with customers in the afternoon, semi auto only.
Good site, good bunch of lads.
I think the fee is £50 with a box of paint, air is via BOC tanks so advisable to take dive cylinders if you have them. Best to call to let them know you're coming.