A double socket outlet made in the UK by MK Electric.
This has many high quality features, including shutters which can only be opened by inserting the correct 3 pin plug (most other makes have shutters opened by inserting the earth pin only).
The socket as supplied in it's fully assembled state.
Note that the switches remain in position, as they have their own mounting points in the grey backplate.
Both sides are connected to the same set of incoming terminals via brass bars along the top of the grey plastic. Both brass pieces are made from a single piece of metal.
The red indicator on each switch is a separately moulded piece of red plastic, rather than paint or printed on.