In reply to steve_gibbs:
I think the rules are straightforward once you get your head around it.
You have to look at them from the point of view of the routes / walls you want to climb, (not the season) and each ones category is clearly shown in the guide at the top of the page for that area.
All Year Access - is exactly what it says
WW Winter only - is winter only from 1st October to 15th March
Summer Season - This is the one that requires you to read the small print. Access is allowed all year round, but not July, August or the Bank Holiday weekends in May and Easter. The small print / map will tell you the exceptions to this that are also allowed after 6pm during those Summer holidays.
It is a lot of rules to be aware of, but these are the conditions of the access agreement so we all need to get on top of it.
Lots of people I talk to there assume that "Summer Season" means all year round, or that the rules are based on "North or South sides", which it is not. The rules are individual to each route / wall as described in the guide, and you need to check the latest years map for exceptions. The complications are where the rules have been relaxed during certain times, which we shouldn't be complaining about.