For London the 2010s was a brilliant (in the British sense of the word) decade, as it grabbed the gold ring of international finance. Gleaming towers — the Shard, the Leadenhall — shot up; crime rates dropped. Cultural exports such as “Downton Abbey” and Coldplay ushered in a wave of Anglophilia, punctuated by the 2012 Olympic games, which opened on a cheeky note: actor Daniel Craig as James Bond, the MI6 agent, accompanied a stunt double for Queen Elizabeth in a helicopter, both parachuting into a stadium while crowds cheered. MI6 and another iconic venue, Wembley Stadium, play minor roles...