Lighting earth issues - could I just run a fused spur from the power circuit

However, if you actually measure it, it is in fact 240v. Fit a 230v incandescent lamp, and you can expect a short life from it.
Far rmore usually near the 230V mark here. Can be down towards 220V in some places; up towards 250V in others. Also fluctuates at different times. It's a nominal voltage for a reason. It's never constant.
 
Far rmore usually near the 230V mark here. Can be down towards 220V in some places; up towards 250V in others. Also fluctuates at different times. It's a nominal voltage for a reason. It's never constant.

A rock solid 240 to 242v here. 230v oven lamps, last no time at all, if they are not marked 240v, no point to buying them.
 
"Rock solid" yet fluctuates... But you can't seriously be claiming that it only ever fluctuates within 2V. Complete horseshit if I'm honest.

I don't sit there for hours, watching it, but on those occasions I have checked it, it is always within those bounds. Some small variation, is unavoidable, due to my own loads turning on and off, though less so if measure at the CU, which I never have bothered.
 
Or you can borrow an earth off another circuit if easier. And be more logical when switching off circuits.
Yes, that's kind of what I've already done as a temp fix. I simply have an earth wire run from the light switch to the earth pin of a three pin plug and leave it plugged in. I don't know whether that could be made into something more permanent (ie concealed), but at least it's obvious what's being done this way.
Eventually I'll probably sort the lighting cables out (depending on disruptive future access) so 'borrowed earth' may be a better interim solution than using the spur method.
Thanks all for your further thoughts here. Seems I actually have plenty of options to consider.
 

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