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Yeah, thnaks, they have considered Smart Switches, but the on site wifi is provided by a 4G modem which drops in and out. So using anything that needs a cloud connection can be problematic, it's easier to trigger the raspberry pi with a simple command and then drive the relays. They have a guy...

Thanks everyone for your comments, my initial thought was doing something with 2 way switches but couldn't work out what! MCB inrush current shouldn't be too much of an issue as all the lights are LED, and there is only 4 or 5 rooms. Thanks SUNRAY for the diagram, I won't need the additional 2...

So a strange request I have had to help someone out. Basically they want to be able to switch all the lights on in a building at once, regardless of the position of the wall switches. They want to also turn them all off (or at least return to the previous state when they turn the central...