I always do and my son does not and we have debated it many times. Until you remove the socket it is earthed with the two brass screws and it should be turned off before removing so he has a good point.
Hi, as ERIC shows this has been a contentious issue for years, bottom line is neither 16th or 17th regs require it but many people fit anyway.
NICEIC insist their registered contractors do fit 'pig tails'.
Regs only require them if using a conduit/trunking system for your earth, to ensure earth brought forward from back box to front plate.
I don't like fitting them as it's more wiring than necessary in an already tight space,
NB: 16th reg 543-02-07 pge 117 17th reg 543.2.7 pge 131
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