I watched the film G.I. Joe: Retaliation on a popular streaming film site. It was a dumb film, but I knew that before I clicked the button to play. I was drinking beer while I watched it, but I am pretty sure that at one point in the film, the centre of London was blown up. The satellite weapon was ready to destroy London straight away, but they had to wait to destroy other cites around the world.
So that is the "special relationship", the US will destroy London first. Thanks guys.
There was a ceremony at the end, where the president was happy that he and the world was safe, but they never mentioned the destruction of London at all.