Single socket to 2 gang.

[Rorschach]

I don't whether the item exists or my goggle fu is failing me. I want to covert a single socket into a double, the single is in a recessed back box. I don't want to/can't chase it out for a double box. Is there a double box converter type thing that will screw onto a single back box in some way? Just trying to make this as easy as possible and ideally easily reversible.
I know I could use one of those multi sockets but I don't really like those as they always feel like they are putting too much stress on the socket.

[Someone-Else]

Is there a double box converter type thing that will screw onto a single back box in some way

Yes.
The usual places sell them. (Single socket to double socket converter)

[Scotty001]

1 gang to 2 gang socket converter is what your looking for
The link for the first screwfix link I have personal experience with, I've installed 2 into a 1930s built flat that only has single sockets, both have been in 3 years and never had an issue with them.
Screwfix requires a 35mm backbox
https://www.screwfix.com/p/lap-13a-1g-t ... hite/108cc
Or
https://www.screwfix.com/p/schneider-el ... hite/108ft
Requires a 25mm back box

Toolstation
https://www.toolstation.com/socket-conv ... lsrc=aw.ds

[Rorschach]

Now why couldn't I find that!

Cheers chaps.