Michael Hallowes is a former Scotland Yard detective, had has authored a book titled 'Operation Abonar' which is the untold inside story of Britain’s biggest gun-running investigation, which he led.

It explores how MAC10 machine guns began appearing in gangland shootings in the 1990s and the lengths Michael and his colleagues had to go to to bring them in, including a Home Office scandal.

Machine guns from the investigation are still in circulation today.