CCTV cameras captured the trio struggling to get out after allegedly grabbing gold rings and earrings worth over £20,000 from the shop.

The footage shows the three pulling and banging at the door as it locked with them still in the north London shop.

Two of the alleged robbers finally get out, leaving behind the third man, who only escapes when a bewildered passer-by opens the door from the outside.

One of the three men has been jailed for seven years and three months, while police are still trying to identify the others.

The video has been published on the Metropolitan Police Facebook page.