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Thanks Matthew. Yes, ordinary 240v lighting circuit works fine and always has. I don't know what a SPMSU or whatever you called it is. Can you spell it out for a keen pensioner DIYer please? This is for a friend who lives 100 miles away, but I presume that it has a transformer of some...

Three storey house, with an old TV aerial which serves a ground floor TV and digibox. Newly installed cable spotlight system in the attic; when lights switched on the TV signal on ground floor is totally distorted by 'interference'. By my logic it must be one of three things:- 1. TV aerial...