Old MK sockets? Classification code or not?

[Ian1981]

The threads got a bit crossed I think.
Op has put a socket pic up but later wanted to know about unshuttered sockets.

 

[westward10]

He was getting at the earth hole not being shuttered.

 

[Ian1981]

No need to call me an earth hole!

 

[kingeri]

I still have a few of those sockets in use in my house, in the basement and loft. The only reason I changed the others was because the wife wanted fancy ones. Nothing wrong with them, nobody sees them except me, and I like them. I'd like to see someone try and code them, I wouldn't be impressed!