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Jim K wrote:
So what's the correct approach?

Define "modern lights". Brand new light fittings can come with a
variety of electrical fittings. The most common method of fitting
lights is to use a ceiling rose that has loop-in terminals.

Some light switches have the loop in them with a terminal to suit, not the
ceiling rose. I thing Hagar do one. Some Sparks loop the lighting wire to
each light switch box with a terninal block inside, then a wire from the
block to the switch and a wire to the ceiling rose. This is common in old
flats being rewired. Have a deep switch box and all is well. No playing
about with a loop at a ceiling rose - all in the accessible switch boxes.