"Is dangerous cycling a problem" BBC

aparently there are very few instructors who teach changing down through gears anymore, hence the reason theres so many people approaching give way junctions at 30 and dropping the clutch banging on brake, scaring the shit out of anyone on the main road and especially bikes,

Offical advice (Dept Transport, Police, Advance Motorists etc) has been to give visible warning of slowing down (ie brake lights) for as many years as I can remember.