The 2 locations I know of are Faircross parade Barking the timing for this is 8.30 onwards till 10am they try and catch People going into the bus lane but the CCTV car hides behind a van or a larger vehicle so theybare not seen,the other location is Upney Lane Barking directly opposite meadow road where they litteraly park around the corner with the camera up and try and catch people going into the yellow cross hatch boxes.
No doubt other locations would not be hard to find once someone is following the CCTV car n assisting doing their job.