You need witnesses and a complaint to the police. In short, you need evidence. Don't get me wrong, I hate drug (death)-dealing scum; but you have to follow due process.
One of the most horrific drivers I have ever come accross , always seeing him staring at his phone and not at the road, and not to mention this taking place at the end of a school day with young children around. Show off.
Awful driver!! Going to cause a serious accident and end up killing someone, always on their phone and breaking the speed limit. Overtaking on blind bends and overtaking multiple cars at once, disgraceful needs to be taken off the roads.
No where near those council estate urchins!