Here's the plan. Special double-length car numberplates that cause a buffer overflow when read by the Automatic Number Plate Recognition system and let us place a back door into the Congestion Charge central computers. Then we can control all of London's traffic!

Related: Subverting CCTV and facial recognition by wearing, infront of the cameras, specially constructed tribal masks that don't correspond to the expected parameters for face characteristics (eg, a nose a precise amount longer than normal that overflows the nose-length buffer and writes code into an executable area).