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I'd have to dig deep into the regs to find out if there's a loophole for earthing conductors but in simple terms the area behind the skirting board is not in a zone allowed for cables. Because you are talking about an earth cable which could carry a current in a fault condition you should not put a cable there.
However, if it is more than 50mm below the surface then it's allowed.
It's a scenario that you could try and justify on a risk assessment basis, but professionally you probably wouldn't as the potential hassle is worse than the alternative, trunking or hiding in an allowed part of the walls/ceiling cavities. Unless you have wallpaper and can't access the ceiling from above a small channel is just a bit of dust and fill/touch up with paint.
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Airhead
Considered=illegal, or considered=a faux pas?