……….and is it safe to remove and blank off. House is 70+ years old. Is it electrical?
Cheers.
Possibly a flex outlet
Is it an old telephone socket?
No.
As above, possibly a flex outlet for a storage heater?
Screw off the cover.
MK are a manufacturer of electrical sockets mainly.
To me this looks like an old connector for an electrical storage heater. In my Dad's house the connectors were left on the skirting but an electrician had long ago removed the connection to the fuse board.
I've seen similar looking sockets for very old plug in phones (they used a large version of a headphone plug). I wouldn't assume anything without testing for live wire presence.
As above
https://picclick.com/Vintage-MK-Ivory-Gang-Retro-Flex-Outlet-Plate-295837918999.html
Electrical?
Definitely.
That's electrical. It has the old standard of red & black.
Red was live and black was neutral.
I suspect that the house was rewired but the old wires weren't removed but just disconnected (and cut away) at the fuse board. Check if the red (and the black) are live — a cheapo phase tester screwdriver will tell you that.
I don't see any reason to suspect it was rewired
And your last sentence is bad advise for a couple of reasons
The reason drury says that is because a lighting phase tester will tell you there is some sort of power present. But a non lighting phase tester doesn't tell you anything so you can't safely assume there is no power present. They're sometimes useful to put small holes in plasterboard.
Supply could be off-peak so checking may not confirm its defunct
It would be a bad rewire if they're leaving dummy points like that .
Oh bloody hell, that's me told! I completely forgot about that possibility!