Police are trying again to identify a man who is suspected of robbing two bookmakers with a gun.
The first robbery took place at a Ladbroke on High Street, Barnet on November 18 last year.
Officers said the suspect entered at around 9.40am and demanded cash from staff whilst brandishing a firearm.
The second robbery happened minutes later at a Betfred and according to police the suspect threatened a staff member with a fire arm.
He then left on a Yahama motorcycle with cash he took from both bookmakers.
A total of £500 in cash was stolen during both robberies.
Officers said he was wearing a distinctive black crash helmet, with red markings on the top. He has been described as a black man, aged in his 30s and around 6ft 1ins tall, with a corn row hairstyle at the time of the offence.
Police have released a CCTV image of a man they would like to identify and has asked anyone with information to come forward.
Detective constable Kevin Parley, from Central Specialist Crime said: "Six months on and we would like the public to take a further look at this man, do you recognise him?
"We have carried out extensive enquiries to locate the man who was captured on CCTV during one of the robberies. I would urge anyone with information to contact us."
Anyone with information should call officers on 07771 976 557 or tweet @MetCC quoting reference Cad 1889/18Nov.
Alternatively, call Crimestoppers anonymously on 0800 555 111.
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