Cheers Guys!!
If you book through Castle Combe they are Semi Open pit days. We have done a few at Combe with Javelin and Castle Combe Direct, I prefer Semi or Open days, I am not a fan of sessions, great for your first ever trackday, but not so great if you have 2 drivers or more.
With Castle Combe own track days, they operate a semi open pitlane when its busy with 15/20 minute sessions, otherwise they can run open pitlane if its quiet. It was the busiest I had ever seen last week and we only ever queued for the next session, going out on track when the current lot come in.
I noticed they had a trackday on Trackdays.co.uk for a SATURDAY August the 6th, I'm waiting to hear if we can go.