no less than EIGHT cops lurking outside the Ecuadoran embassy in September 2012!!
It did make me wonder why they didn't just pay off the doormen at Harrods to keep an eye out (one of the public entrances has line of sight to the Embassy).
Give them a panic button to push if they see Julian - he's hardly an inconspicuous fellow - and he wouldn't get to the end of the street before Police were on top of him. This is Knightsbridge after all, the rozzers aren't going to be far away.