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I am installing insulation in the walls of the kitchen, using 75mm TP10 in a wooden framework, covered with 12.5mm plasterboard. There is an approximate 25mm air space behind the insulation for cables, radiator pipes etc. but of course at the switches/sockets, the cable has to go through the...

I have a couple of energy-saver bulbs fitted to standard on/off switches. On turning them off, they flash regularly for several minutes. Anyone got any ideas why this happens?