Head mounted cameras are to be worn by armed officers as part of the Met Police's body worn video (BWV) rollout.

The 1,000 Axon Flex 2 cameras are being issued to armed response units in the firearms comment, and are worn on the unit's current ballistic helmets and baseball caps.

So far more than 17,500 BWV cameras have been issued to frontline officers in 30 of 32 boroughs, including Barnet and Harrow, with the remaining receiving their camera before the bank holiday.

Mayor of London Sadiq Khan said: "Body Worn Video is a huge step forward in bringing our capital's police force into the 21st century and building trust and confidence in the city's policing.

"This technology is helping to drive down complaints against officers across London and will make a real difference to those carrying firearms, increasing accountability and helping to gather better evidence for swifter justice.

"As we complete the London-wide rollout, the cameras will also provide our officers with confidence in the transparency of their actions, as they continue their great work on the frontline fighting crime and keeping our city safe."

The BWV cameras are worn by a number of officers from road and transport policing to the dog support unit, and are supposed to have the potential to help bring speedier justice for victims.

Since September 2016, officers have recorded almost 785,000 videos, and have digitally shared more than 3,000 clips a month to the Crown Prosecution Service.

Of the videos taken 460,000 of those have auto-deleted after some time, due to the policy on footage retention held by the Met.

All 22,000 cameras are expected to be deployed by the end of October.