A mother says the three-year fight to prove wrongdoing by a police officer in an incident involving her sons was worth it.

PC Karl Bartlett, a Territorial Support Group (TSG) officer, was found guilty of misconduct in relation to his handling of a traffic stop in March 2011.

The officer has now been given a final written warning by the Metropolitan Police.

The Hayes woman’s sons and the 24-year-old driver had been to a classic car rally. They were driving home when they were pulled over by PC Bartlett and three other officers near the A40 Hanger Lane Gyratory in Ealing.

They were removed from the car by the officers, and the panel at a misconduct hearing which just concluded found that PC Barlett was not flexible in the way he had dealt with the incident and did not realise the impact of his actions on the occupants of the vehicle.

Her two sons cannot be named for legal reasons.

It was previously alleged in court that her son, then aged 14, was forcibly removed from the vehicle by PC Bartlett and then assaulted.

After an investigation by the Independent Police Complaints Commission (IPCC), PC Bartlett was summoned to court for common assault, and convicted of the offence in March 2012.

He was sentenced to three months in jail, suspended for a year, but that ruling was quashed after a successful appeal at Southwark Crown Court on August 31 that year.

The boy’s mother said the family is now ready to put the incident behind them.

She told the Gazette: “We are pleased that our hard work and our complaints have been recognised. This gives us some closure.

“After a long, gruelling experience this is finally over. It has been very emotional.”

The panel found the case against the other officers involved in the incident not proven.

A Metropolitan Police spokesman said: “Following a misconduct hearing that started on March 19, and based on the evidence put before them following an IPCC investigation, the panel found the case against three officers not proven.

“The panel found the case of misconduct proven against a fourth officer, PC Bartlett, who was issued with a final written warning.”

Two of three officers involved, PC Colin Nye and PC Anthony Read, had been acquitted of assault at the first trial.

The boy’s mother attended every day of last month’s hearing.

She said the IPCC had been ‘very good’ throughout the process, and added she was proud of her sons.

“Their focus throughout has been on doing the right thing by exposing the awful way they were treated by police.

“They hope their efforts over the past three years will help to protect other young people.”