Stormzy was allegedly caught out by an off-duty police officer as he used a mobile phone at the wheel of his £225,000 Rolls Royce, a court has heard.
The rapper, real name Michael Ebenezer Owuo Jr, 31, is facing a trial over the incident in West Kensington in March when he is accused of flouting the rules around mobile phones.
The star denies using his phone and is now set to face the charge at a trial in January next year.
At Wimbledon magistrates court on Thursday, prosecutor Alice Holloway set out details of the incident on Addison Road in West Kensington on March 7.
Ms Holloway said the police officer witness is crucial to the case against Stormzy.
“He is an off-duty police officer who saw the defendant driving while using a mobile phone,” she said.
“His vehicle was alongside Mr Owuo junior’s vehicle, and although the windows were tinted he could see the defendant using the mobile phone while driving.”
She added that the PC had “produced footage” of the alleged incident which “was automatically taken while he was driving”.
Humzah Ilyas, defending, said Stormzy denies using his mobile phone and will fight the allegation at a trial.
“The issue is a factual denial that he was using the mobile phone,” he set out.
At an earlier court hearing, Stormzy pleaded guilty through a lawyer to using a second supercar, a £200,000 yellow Lamborghini Urus, with illegally tinted windows while driving in Kingston-upon-Thames near his £2.5million home in October last year.
He is set to be sentenced for that offence, having admitted causing a danger to other road users, after his trial over the alleged mobile phone incident.
At Thursday’s hearing, Ms Holloway asked for the October 16 trial date to be vacated as the police officer who accused Stormzy may be giving evidence to a jury trial.
“He is absolutely essential to the Crown’s case,” she said.
When the court offered an alternative date of November 27, Mr Ilyas said Stormzy is not free for a trial until January next year.
“Our client is an international musician and he has work commitments”, he said. “He is unavailable due to pre-existing work commitments.”
Magistrates initially resisted the ideal of adjourning until January and asked if Stormzy had a particular concert or recording session when the two-hour trial could be fixed in late November.
But the chair ultimately relented, saying she did not want to “dance the fandango” over dates, and set the case down for a trial on January 2.
Stormzy has not been present during the two court hearings of his case.
He denies using a mobile phone while driving, and has admitted using a motor vehicle in a condition likely to cause danger of injury.