Some of you might now that I was a great fan of the British spy show Spooks. So it was my mission to find the building they called MI5 Headquarters. And I found it!
It wasn’t the actual MI5 building, of course, but the Freemasons’ Hall. The real MI5 building is best seen in the latest James Bond film Skyfall (it gets blown up). I walked past it on another walk, incidently, and saw the MI6 building across the Thames. I admit that there were a lot of security cameras about the place.