Using phone handset whilst driving

Say I wanted to use my spare time to volunteer as one of them not-quite-police people you see doing fuck all around town. Were I to spend my time watching the roads in search of idiots using mobile phones whilst driving, would I be able to dish out fines?

There's often confusion between Community Support Officers who are salaried yet don't have a warrant card nor do they have powers of arrest.

And Special Constables who are essentially unpaid volunteers working a set number of hours a month that fits in with their other work commitments. They do have a warrant card and full powers of arrest, they also get the same training as a regular Police Constable although their role is one of supporting the regular police. It's a valuable way of doing something for your community but you wouldn't be able to fine someone for driving whilst talking on their mobile unless in uniform. Although flashing your warrant card at them and politely asking them not to be complete cocks would no doubt have the desired effect.