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Thanks mapj1 for your helpful contribution. What are the pros and cons of light bulb bayonet fittings verses screw-in fittings? I lived in the U.S.A. for 13 years and can't remember a seized screw-in fitting. Of course it's possible to over-tighten them but you'd have to be ham-fisted to do that.

Thanks for your responses. Why is there double and single pole? In what circumstances would you want to use double rather than single, and visa versa?

Double switched, single switched, double pole, single pole. What is the difference between these 'outlet' sockets and when is it appropriate to use each one ? Thanks.