I wanted to find out a lot more about who, how and where the WW2 ltunnels were used and we were treated to a series of video clips about the outbreak of war and operation Dynamo, all of which are available elsewhere. We were shunted from room to room for this...why? The castle is large and impressive and you have free range over much of it, not so the WW2 tunnels understandably. Sandwiches in cafe rather curly. Come English Heritage you normally do this sort of thing so much better.