I've read a few threads recently recommending a mains filter to improve picture quality on plasma screens, and I'm wondering whether this would be worth doing in my circumstances. I've recently rewired my house and currently all my lounge appliances (Linn hifi separates, Panny PW6 plasma, sky+, dvd) are on a single spur from the consumer unit. This spur actually covers the whole downstairs except the kitchen but nothing else is plugged into it. Would I expect to see any improvement if I added a mains filter ? Or are people only noticing differences because their plasmas are typically sharing the same spur with loads of other electrical equipment (lamps, computer equipment, kitchen stuff etc) ?