The NPSA enters the chat...
National Protective Security Authority
We are the National Technical Authority for physical and personnel security. As part of the Security Service, MI5, we make the UK more resilient to terrorism and state threats. NPSA's risk based guidance, covering: vehicles & drones, insider risk, sabotage, unauthorised entry, hostile reconnaissance, digital risk, explosives & weapons, intellectual property, fire & arson, democratic interference and CBRN
And the MGS:
The MGS has guarded the defence estate for over 25 years and provides unarmed guarding services for over 100 sites in England, Scotland and Wales, including high profile locations such as MOD Main Building in London and His Majesty’s Naval Bases at Portsmouth, Devonport and the Clyde. We are passionate about the services we provide and work hard to keep pace with developments in the security industry, as we seek to be the unarmed guarding provider of choice.
The MGS (MOD Guard Service) plays a vital role supporting MOD security.
www.gov.uk