Demon Tweeks do supply and fit, they're based in North Wales, and there will be specialist companies somewhere near you that will be able to offer the same sort of thing.
A lot of tuning companies advertise in Auto Trader, so next time you're in a certain well known high street newsagent that rhymes with W H Myth, surreptitiously look through a copy and make some notes... or spend £3.20 on it and take it home, if you're loaded...
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