02-10-2017 - London Police Officers laying out a Talon spiked net outside Parliament to prevent vehicle terror attacks against crowds attending major events. The nets are capable of stopping lorries weighing up to... © Stefano Cagnoni

02-10-2017 - London Police Officers laying out a Talon spiked net outside Parliament to prevent vehicle terror attacks against crowds attending major events. The nets are capable of stopping lorries weighing up to... © Stefano Cagnoni

02-10-2017 - London Police Officers laying out a Talon spiked net outside Parliament to prevent vehicle terror attacks against crowds attending major events. The nets are capable of stopping lorries weighing up to... © Stefano Cagnoni

02-10-2017 - London Police Officers laying out a Talon spiked net outside Parliament to prevent vehicle terror attacks against crowds attending major events. The nets are capable of stopping lorries weighing up to... © Stefano Cagnoni

02-10-2017 - London Police Officers laying out a Talon spiked net outside Parliament to prevent vehicle terror attacks against crowds attending major events. The nets are capable of stopping lorries weighing up to... © Stefano Cagnoni

02-10-2017 - London Police Officers laying out a Talon spiked net outside Parliament to prevent vehicle terror attacks against crowds attending major events. The nets are capable of stopping lorries weighing up to... © Stefano Cagnoni

15-08-2009 - Air Robot device or AR100B AirRobot drone - a Vertical Take Off and Land covert aerial camera surveillance platform used to monitor protestors at the Unite Against Fascism protest outside the BNP Red... © Jess Hurd

15-08-2009 - Police piloting an Air Robot device or AR100B AirRobot drone - a Vertical Take Off and Land covert aerial camera surveillance platform used to monitor protestors at the Unite Against Fascism protest o... © Jess Hurd

01-04-2009 - Photographers file pictures during lull in the protest at G20 Meltdown, City of London on the eve of the London G20 Summit. © Paul Herrmann

07-11-2008 - Drug detection, swab is taken from a person's hand by a member of the Special Constabulary, before being fed into an ion track machine. The machine can detect tiny amounts of controlled drugs present... © Rogan Macdonald

07-11-2008 - Drug detection, swab is taken from a person's hand by a member of the Special Constabulary, before being fed into an ion track machine. The machine can detect tiny amounts of controlled drugs present... © Rogan Macdonald

07-11-2008 - Drug detection, customers are tested for drugs by the Special Constabulary as a condition of entry to a pub near Canterbury city centre. An ion track machine detects the presence of controlled drugs o... © Rogan Macdonald

07-11-2008 - Drug detection, swab is taken from a person's hand by a member of the Special Constabulary, before being fed into an ion track machine. The machine can detect tiny amounts of controlled drugs present... © Rogan Macdonald

07-11-2008 - Drug detection, swab is taken from a person's hand by a member of the Special Constabulary, before being fed into an ion track machine. The machine can detect tiny amounts of controlled drugs present... © Rogan Macdonald

07-11-2008 - Drug detection, swab is taken from a person's hand by a member of the Special Constabulary, before being fed into an ion track machine. The machine can detect tiny amounts of controlled drugs present... © Rogan Macdonald

07-11-2008 - Drug detection, swab is taken from a person's hand by a member of the Special Constabulary, before being fed into an ion track machine. The machine can detect tiny amounts of controlled drugs present... © Rogan Macdonald

03-04-2008 - A Police officer monitoring traffic using a motorcycle based mobile speed camera as pupils walk past on their way home from school. Stratford upon Avon, Warwickshire. © John Harris

03-04-2008 - A Police officer monitoring traffic using a motorcycle based mobile speed camera as pupils walk past on their way home from school. Stratford upon Avon, Warwickshire. © John Harris

03-04-2008 - A Police officer monitoring traffic using a motorcycle based mobile speed camera as pupils walk past on their way home from school. Stratford upon Avon, Warwickshire. © John Harris

03-04-2008 - A Police officer monitoring traffic using a motorcycle based mobile speed camera as pupils walk past on their way home from school. Stratford upon Avon, Warwickshire. © John Harris

03-04-2008 - A Police officer monitoring traffic using a motorcycle based mobile speed camera as pupils walk past on their way home from school. Stratford upon Avon, Warwickshire. © John Harris

03-04-2008 - A Police officer monitoring traffic using a motorcycle based mobile speed camera, Stratford upon Avon, Warwickshire. © John Harris

03-04-2008 - A Police officer monitoring traffic using a motorcycle based mobile speed camera as pupils walk past on their way home from school. Stratford upon Avon, Warwickshire. © John Harris

03-04-2008 - A Police officer monitoring traffic using a motorcycle based mobile speed camera as pupils walk past on their way home from school. Stratford upon Avon, Warwickshire. © John Harris

24-11-2007 - Police officers from a Forensic Collision Investigation Unit attending the aftermath of a serious road traffic incident. Brighton, UK © Howard Davies

22-03-2003 - A police cameraman films anti war protestors from behind the perimeter fence at the Foil the Base event. Menwith Hill listening base, North Yorkshire. 22/3 2003. © Mark Pinder

08-05-2000 - Metropolitan police photographer and forensic scientist gathering evidence at the scene of a murder in north London © Stefano Cagnoni