The bunker yes, bet jackie knows just where it is.
I've been there. You go in sand pick up a handset Listen to the comentary as you go and just follow your own nose. It is very 60's and more like the ipcress file rather than James Bond. You end the tour by being lead into a cafew where there's stuff they want to flog you. You can have a cup of tea before you make your way out through a short tunnel into the fresh air.
The old chap in the cafe asked us how we found the place? He told him there was a dirty great sign outside saying
SECRET NUCLEAR BUNKER