With 1 street spy camera per 25 Brits, that long ago effectively happened. However, serious crime has steadily climbed as the spy camera network increased there - and headline crimes there recently often include reports that no spy camera saw anything!
So many spy cameras - with a higher ratio in urban areas - mean invariably that no place in urban areas isn't (theoretically) viewed. However, spy cameras work poorly at night - when the attacks on cameras are happening. They work even less well on foggy nights - as they are "in the clouds."
Britain's elites are losing the war on their own people that they started - as they are unable to keep pace with the destruction of the traffic cameras and spy cameras!