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Thanks - so like the first diagram in http://www.lightwiring.co.uk/tag/2-way-switch-wiring-diagram/ - except that the Neutral does not go back through the switches as shown, but runs with the strappers.

And I should have said - yes, 20mm round conduit, through boxes at each light, 1.5mm 6491X cable, earth to every point.

Thanks all for the prompt responses, and yes (Geoff and Andy) I can see the potentially fatal error of my ways in having one or other of the wires at the lights always live - so I'll not do it that way !  Murdoch - I cannot find a wiring guide which does not take the supply to the lamp (/ceiling...

I want to install two off two-way lighting switches, one at each end of a long building, with two (or more) lights in between. Supply is at one end, near one of the switch positions. All wiring will be done with single-core cabling in plastic conduit. As I understand normal two-way switching...