>>The majority of the wiring remains at ceiling level. Only the live to the lamp is passed downwards through the switch, and back up again to the lamp via the sleeved black.
I guess it must vary because on mine in the UK both are passed down. Both in it's very old [and now gone] wiring and its replacement brand new wiring.
If you pass only the live down that typically implies that the neutrals and/or lives are joined in the ceiling. I don't like hidden joins, I prefer joins in the switch or behind an accessible and removable panel however well and securely they are made. In the US it must be that way by law, I don't know about the UK.
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