Police in Lewisham and Croydon have begun to wear body-worn cameras as part of a trial across other parts of Greater London.

Officers in the borough have been selected to take part in a pilot programme by the Met Police in the use of the new equipment.

The teams using the cameras will be assessed and compared with teams without them.

According to the Metropolitan Police Commissioner, Sir Bernard Hogan-Howe, the cameras should allow speedier justice for victims, especially in domestic abuse cases.

Our correspondent Weidong Lin answers all your questions on how these cameras will affect you:

A lot of people are concerned about having these cameras on policemen and the potential privacy violations which could arise.

What is the view of the police and their rationale for this implementing this?

A lot of people are concerned about being surveyed and photographed by police officers. But as of now, we understand that the cameras will only be placed on front line emergency response officers.

So this means that, if you see a normal patrol officer, you are not being photographed or caught in a video recording.

So, if I was in the middle of an emergency situation being handled by these front-line police officers, would I be recorded?

According to the protocol, officers using the body-worn video-cameras will not have them operating at all times.

They will only be switched on when an incident occurs or when an officer wants to collect statements or evidence.

And, officers will inform those present when the camera is switched on.

Footage from the cameras not needed as evidence will be removed from the system within thirty one days.

Also, people who have been recorded have the right to see footage of themselves.

How do these cameras aid the work of the police?

In normal circumstances, the police officers have to log every incident with pen and paper, based on memory.

With these body-worn video-cameras, they can spend less time on paperwork and writing statements.

The use of these cameras in other countries have also shown to moderate the behaviour of people involved in incidents.

That would hopefully safeguard the well-being of police officers in their duty as well.