Further down the road, Mr Monkey found the slipway that the DUKWs use to go in and out of the river. This is next to Vauxhall Cross, which is the headquarters of the Secret Intelligence Service. Of course, if they've any sense, they'll really be somewhere else, in a place that's actually secret.
There's a page about Vauxhall Cross at Emporis (a website about tall buildings).
Copyright Rik Shepherd and Mr Monkey.