WOT? CCTV not sufficient???
I would expect the millions of cameras monitoring your police state to be sufficient to watch the exits of an embassy without requiring expensive meatsacks to do the job. Britain is obviously not reluctant to put up cameras on every pub and corner. Why didn't they simply add twenty more on the embassy?
I can answer my own question. The Pale One has defied the Stasi of the UK and US, they will stop at NOTHING to make him pay for it, and want everyone to know it. Cops are the same everywhere, they will never admit error, and they will never give up. The Sun will expand to a red giant and they will still be trying to extradite his decomposed remains to face trial.