A metal cased consumer unit with four Lupus Midget circuit breakers.
Four circuits, which was common at the time of installation - probably 1960s or 1970s. Unusually this has circuit breakers fitted rather than fuses.
Both the circuit breakers and the main switch are Off in the up position - the opposite of modern devices.
The top of the unit is covered with the usual emulsion paint.
inside they are metal tabs which hook under the lip of the case. This is far more robust than a threaded connection, as a screw into sheet steel would quickly wear the hole to a larger size and prevent the screw from securing the lid.
The neutral bar is above the circuit breakers.
Incoming earth connects to the threaded stud at the lower left of the case, with the earth bar for circuit wiring next to it.
Screws here attach to the live busbar behind the circuit breakers, and the neutral bar can be seen directly above.
Note the dual screws securing the black insulated neutral wire to the bar.
The red insulated wire connects the main switch to the bar.
The vertical brown pieces are insulating material which support both the live busbar and the neutral terminals.
The main switch cover has been removed, showing the solid brass terminals with two screws in each.
The incoming switch terminals can be seen to the left side, and are of solid brass with dual screws.