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This definitely comes under the heading of jobs I wish I'd never started... Can someone please for the sake of my sanity tell me where I am being an idiot? Short version - on a lighting circuit, how can R1+R2 = 0.37 to 0.72 ohms with switches on but in places give 16 to 409 ohms with switched...

A plumber has fitted a Grant Vortex Pro External Combi and then run away without fitting a controller to it. The manual asks for a "single channel 230V with voltage free output contacts" The boiler isolation plug has 5 connectors (CH, HW, E, N, L). So to have a Central Heating controller...

Looking at a house that has floor sockets installed in a few rooms (tiled kitchen floor, living room and hobby room). Is this allowed in a domestic install at the latest regs? Thanks Wiksey