My very old sitch gave up last sunday-worn out, it would not switch off. B&Q was open so I took the switch there for a replacement. They sold me the one which looked similar (Im no electrician) and promised to replace if it didn't work. My old switch is marked 5 amp. the new one 16 amp with 4 terminals, 2 for power in and 2 for load out. and after careful connection did not work. By the way the switch is connected with the bathroom extractor fan and this also does not work now. To day I visited the electrical shop to seek advice and a proper switch. They sold me a 6 amp with three connectors, L1, L2 and Comp. I connected live to L1, neutral to L2. Comp left empty and earth connected to terminal on backing plate. No joy. My electrician may be able to visit Friday meanwhile no light in Bathroom. Is there anything obviosly wrong in my approach or am I to await the expert on Friday (maybe) 
