"Graeme Wall" wrote:
[...]
For the underground, you want MI6. they apparently have a connection from
a tube station to Century House.

You won't have much success at Century House these days, as it's now a block
of luxury flats.

Then:
http://www.flickr.com/photos/37839858@N02/4854175619/

Now:
http://www.flickr.com/photos/ddtmmm/4777960980/
http://www.flickr.com/photos/37839858@N02/4854176283/

Or maybe that's just what they want us to think...
;-)