A West Hendon man has been convicted of murdering a father-of-two who was setting off on the school run outside his Wembley home when he was gunned down.

Jason Greene, 29, had just got into his car on the morning of July 18, last year, when he was shot in the chest while his young sons looked on in horror.

Christopher Toussant-Collins, 19, of Derwent Rise, was found guilty of his murder at the Old Bailey on Thursday.

He believed Mr Green was responsible for the murder of his friend Shaun Stanislas, 24, who was shot dead a year earlier, and was seeking revenge.

Detective Chief Inspector Scott Wilson of the Met's Trident unit, which tackles gun crime in afro-caribbean communities, said: "This was a callous and calculated attack, committed in front of two young children with no concern whatsoever for their safety.

"This verdict today shows the determination of Trident to apprehend and convict those responsible for gun crime and who have a total disregard for life.

"I would like to thank the community whose contribution by coming forward and providing information has been pivotal in this investigation and led to this conviction."

At about 8.30am on the day of the killing, police received reports of a man with a gun on Bowater Road. Minutes later they received further calls reporting a shooting.

Officers found Mr Greene suffering from gunshot wounds and despite attempts to resuscitate him he died at the scene.

Two cars, holding at least six people, had been waiting for Mr Greene on Bowater Road, Chalk Hill, that morning.

When he got into his Audi his sons, aged four and eight also got in - the older one in the front and the younger in the back.

The two cars parked nearby pulled up a short distance away from the Audi, a man got out of one of them and shot him.

The vehicles, a Vauxhall Vectra and a VW Golf convertible, were later found abandoned and on fire in the Welsh Harp area, off Cool Oak Lane.

In a public statement issued after the trial Mr Greene's mother, Gemma Brown, said: "As Jason's mother, the pain of his loss cannot be expressed adequately in words - only someone who has endured such a loss could understand this kind of almost unbearably hard pain.

"His killers chose a time when he was at his most helpless, when his young children were with him.

"The fact that the children were in the car to witness their father's murder makes this event all the more horrendous."

A total of 13 other men have been arrested in connection with the murder but all were later released without charge.