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Thanks to everyone who has replied with such useful help and information. One final question - if the cable that is exposed to the outside has deteriorated over the 26 years, would this apply to the whole cable?, only there is at least 30cms of cable slack which has not been exposed, sufficient...

The wire outside is 'open to the elements' and according to the person we bought the house off has been like that since the house was built in 1980 - there was meant to be an outside light there but they put a window in instead of the patio doors on the plans! The wire is red/black/earth...

Thanks Crafty1289 but I suspect I may have mislead you when I said earth + red are connected to L1. All the earths are connected together and fastened to the metal switch box - what I meant was that the first cable had an earth connected as above, and a red connected to L1, and a black connected...

I have a single light switch which is part of a 3-way switch for the lounge lights. One cable has earth + red connected to L1 and black connected to L2. Another cable has earth and just red connected to c. All works OK. There is another earth + red cable in the switch which is not connected to...