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Our central heating system loses pressure in a dramatic way (gauge is down to zero within 2 weeks of topping up the system). This has been going on for several months. We've looked at all the radiators and at the wall/floor around the boiler, and re-checked an underfloor pipe that was mended a...

I've just wired up a new pull-cord switch for our shower (a 45A DP ceiling switch). This switch has both a red pilot light and a dial that reads 'On' or 'Off' as you pull the cord. I looked carefully at the existing wiring and the wiring diagram; there were basically 2 sets of red(L), black(N)...