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Less facetiously:
https://www.amazon.co.uk/Pattress-Wall-Socket-Template-Electric/dp/B01E1LFU1M
and a mains drill with dust extraction worls well.
If you are (ever) West
I have a plastic template you could borrow.
Also, I want to inset my plug sockets on a dividing wall. Looking online it seems an angle grinder is the best way to get into the brickwork. Anyone done this?