Chuckle, I well recall a strange thing before this house was rewired in the
70s, when stripping off some wallpaper somebody had earthed a box by a piece
of copper tap up the wall to a copper water pip.
This was located in between floors.
Highly dodgy, but then things of this kind were done back in the 60s and
before I'm sure.
Brian

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The Sofa of Brian Gaff...

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I've discovered that the wiring to a light switch is in 2 core (i.e. no
earth) so the metal back box was unearthed. Getting an earth to it would
be a royal pain so I've removed the metal back box and plan to sink a
surface box so the back of the switch is in an insulated enclosure and
there's no chance of the screws making contact with a live wire if a wire
broke.
What's the opinion of the jury?
Any alternative solutions?