'Sport England has teamed up with the RSPB to encourage more people to get active among nature. From canoeing to bouldering, there are plenty of outdoor activities taking place at RSPB reserves. Visit rspb.org.uk for more information.' (I haven't looked yet).
Might be useful with orienteering access. Locally we have had good access to one reserve, but not on another, which we previously used until they purchased the land.
