Security Command is formed of three units that provide protection of the Palace of Westminster, Heathrow and City of London Airports, and additional security and counter-terrorism co-ordination for London.
SO17 Palace of Westminster
SO17 works with the Parliamentary Authorities to provide a safe and accessible environment for peers, members of parliament, employees and the public.
Heathrow Airport and London City Airport are policed by a Metropolitan Police Service Operational Command Unit (OCU) known as Aviation Security.
SO20 Counter Terrorism Protective Security Command
SO20 is responsible for delivering an effective and efficient structure to support the UK counter terrorism strategy known as CONTEST, in respect of the PROTECT strand.