In reply to KomClimber:
Generally there is free and open access to all crags. However there are some crags that have restrictions at certain times of year due to nesting birds, sometimes it's just one buttress rather than a whole crag.
As Humptydumpty says, check the BMC RAD page -
https://www.thebmc.co.uk/modules/RAD/ and ask on here if you need to know about a particular crag.
Perhaps the biggest restriction on our crags is the weather
At the moment that isn't a problem but sometimes a crag might not get any visits from one year to the next because it doesn't come in to condition.