eljeffo,
I seem to remember that coming up on a driving course I was on. The regs are so old that there are some funny bits in it; you indeed do not need any lights on in street lit <30mph zones iirc.
Thing is, if they have been sitting on a shelf at Renault for 6 years they may need refurbing soon anyway.
I'm also tempted to get a pair, it's still a lot of money though..
BTM don't make them. JP Exhausts in Macclesfield do.
Fred from BTM assisted the design and until now asumed the role of stockist for the Yoz. I assume he has decided the constant hassle is not worth it and KTR have taken over the responsibility. A good thing I suppose, makes them easier to get...