A teenager who rammed a stolen car into a police officer on a marked motorbike following a high-speed chase across north London has been jailed.David Doyle, 19, was spotted by constable Richard Keel driving dangerously along Camden Street.PC Keel began a pursuit, only for Doyle to reverse towards him multiple times, knocking him off his bike.Doyle then sped off leaving the officer with significant injuries at roughly 6.20pm on May 17. Members of the public came to PC Keel’s aid before alerting the London Ambulance Service.Officers launched an investigation the same day, locating the stolen vehicle one mile away from where the attack occurred.