I took the pictures below on Essex Road in Islington in February.
The vehicle concerned was not monitoring a bus lane, and it was a good three quarters of a mile south of the congestion zone. The van, which appears to be registered to Capita, was solely concerned with monitoring people and vehicles as they went about their business.
Since then I have seen the vehicle just passed Whipps Cross Hospital, again randomly monitoring passers by.
It does not make me feel any safer, but its a nice little earner, no doubt at public expense, for Capita.