I'm not crazy, the attack has begun.
You have skirted around (perhaps professionally skirted around .. what do you do?) my point;There’s a standard question re sign off certs for any notifiable works.
Replacing a socket is NOT notifiable work.
As in .. NOT notifiable.
An interlock ceeform is an ALLOWED socket.
Swapping an ALLOWED socket for another ALLOWED socket is, if I erred to mention, NOT notifiable.
What is your anguish over this? I suspect you are some electrician who feels put out of a job or something?
So why are you still on that song track?