A deployable surveillance, security and/or enforcement unit, comprising: a container configured for deployment from a vehicle or by air at a surveillance, security and/or enforcement location; the container comprising: two or more removable modules (11, 12, 13, 14, 15) having equipment for performing surveillance, security and/or enforcement operations, wherein each module is sized to accommodate a person standing; each module is removable from the container and is removably connected to utilities in the container by a docking mechanism (30, 240), the utilities including one or more of: power, air-conditioned air, water and communications; a housing having first sides and second sides, the first sides being longer than the second sides, characterised in that the housing has at least one opening in one of the first sides for receiving the two or more modules into the container, wherein the unit comprises doors at said one of the first sides to provide said at least one opening, said doors configured to open substantially the full length of said one of the first sides of the container for loading the two or more modules into the container there through; and tracks or rails fixed to the floor of the container extending across the container in a direction transverse to the first sides of the container, to guide the loading of the modules into the container from the at least one opening in the one of the first sides of the housing. a container configured for deployment from a vehicle or by air at a surveillance, security and/or enforcement location; the container comprising: two or more removable modules (11, 12, 13, 14, 15) having equipment for performing surveillance, security and/or enforcement operations, wherein each module is sized to accommodate a person standing; each module is removable from the container and is removably connected to utilities in the container by a docking mechanism (30, 240), the utilities including one or more of: power, air-conditioned air, water and communications; a housing having first sides and second sides, the first sides being longer than the second sides, characterised in that the housing has at least one opening in one of the first sides for receiving the two or more modules into the container, wherein the unit comprises doors at said one of the first sides to provide said at least one opening, said doors configured to open substantially the full length of said one of the first sides of the container for loading the two or more modules into the container there through; and tracks or rails fixed to the floor of the container extending across the container in a direction transverse to the first sides of the container, to guide the loading of the modules into the container from the at least one opening in the one of the first sides of the housing. two or more removable modules (11, 12, 13, 14, 15) having equipment for performing surveillance, security and/or enforcement operations, wherein each module is sized to accommodate a person standing; each module is removable from the container and is removably connected to utilities in the container by a docking mechanism (30, 240), the utilities including one or more of: power, air-conditioned air, water and communications; a housing having first sides and second sides, the first sides being longer than the second sides, characterised in that the housing has at least one opening in one of the first sides for receiving the two or more modules into the container, wherein the unit comprises doors at said one of the first sides to provide said at least one opening, said doors configured to open substantially the full length of said one of the first sides of the container for loading the two or more modules into the container there through; and tracks or rails fixed to the floor of the container extending across the container in a direction transverse to the first sides of the container, to guide the loading of the modules into the container from the at least one opening in the one of the first sides of the housing.