changing cooker control switch (with socket) into double socket

[dennis]

AFAIK dual boxes don't as the two plates would then be hard to line up.

Twin boxes (as for twin sockets) have adjustable lugs.

[PeterC]

I bought a couple of plastic patresses that were nominally 5mm deeper than the ones I had - nett gain of 2mm. Also, why so many different corners? Square and radiused, OK, but square ranging from smooth to finsharp, radii of several values - then there's the taper, so boxen of nominally the same size leave a ledge one way or t'other between the plate and patress. Yes, using them from the same manufacturer is (usually) OK, but changing a patress can be a tad fraught. [/rant]