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TvH
It's probably not a ring main for the lighting per se, it's usually a radial but the classic three plate means that your lighting circuit loops in and out and a switch line allows you to switch the supply on and off. What you see when you open them up is a mess of wires with none of them identified and quite often not sleeved to tell you that a blue cable is actually live switch return! As a consequence a lot of people cock it up.