Re: driving licence is NOT an ID
"Thank you sir, I note that your engine is still running therefore here is a ticket for using your phone whilst driving!"
There was a local case of a district nurse fined for user her phone. She was parked up with the engine off but still classed as "in charge" of the vehicle. I can't remember the exact details. Maybe the ignition was still "live".
It was the local BBC news a year or two back, Look North for Tyne & Wear/Cumbria but my GoogleFu is failing me this evening.