A driver caught on the phone at the wheel stuck his middle finger up - to undercover police officers from Avon and Somerset Police.

The motorist realised he was being filmed - but was unaware it was by officers on patrol.

The footage was captured by officers conducting mobile phone enforcement in an unmarked vehicle.

The offender can be seen with his phone to his ear as the police drove alongside him. Once the driver realised he was being filmed, he put the phone down and stuck his middle finger up.

Police say his response showed the 'total disregard' some people have for the law.

Avon and Somerset Police Roads Policing teams said on Twitter: "Officers conducting mobile phone enforcement in an unmarked vehicle observed this driver on his phone. His reaction, before noticing that the person recording him was a Police Officer, shows the totally disregard some people have for the law & #RoadSafety!"