Frequently see young men/ kids on scooters/ bikes with no helmets, just balaclavas, often two up around the bell green/ sydenham area.

The last one I saw was a completely black motorbike with no number plate. The rider took himself and his passenger the wrong way through the lights, on red.

Quite scary to think of the damage they could do to someone or something with no insurance. One would assume they could get up to all kinds of stuff if the police aren't interested.

Expensive, but if they don't want to chase, I believe they have helicopters capable of tracking people on the ground.