White plastic fused connection unit, switched, with flex outlet hole.
It is therefore impossible to replace the fuse without having a screwdriver - possibly of value to stop children / others removing the fuse.
The switch is double pole, switching both line and neutral. Note the ON / OFF legends above and below the switch.
The other terminals with brass cup washers are for the appliance flex - N top left, L top right, E bottom right.
The flex is clamped under the flat bar which is fixed with two screws.
The front has the oval MK logo and the word FUSED.
The 13 amp Bussmann fuse is a more recent replacement.