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I have just partially drained my system(closed the radiators) to move a radiator pipe. When i filled the system back up the radiator closest to combi boiler wont get hot but all the others upstairs and downstairs do. I could,nt turn off this radiator as return valve stuck(in open position)...

I have bought a house which only has 1 lighting circuit throughout. i want to split this circuit, so i have an upstairs and down stairs circuit. Does anyone have any hints or tips on the easiest way to achieve this