The SEG provides the staff for the close escort and traffic management of nuclear weapons convoy movements.
During these convoy movements it works alongside military personnel from Fleet Protection Group Royal Marines and Atomic Weapons Establishment civilian staff.
There is liaison with local police forces whilst the convoy is en route.
It also provides specialist support, to other units of the Ministry of Defence Police and elsewhere; such as ceremonial duties during the visit of the Queen to HMNB Portsmouth for Trafalgar 200.
An Immediate Response Force would be embedded within the convoy, or in the case of air transport be ready to fly by helicopter to the scene.