Thanks for the welcome.
My B is a '96. We appear to be about 130 miles apart so I guess my local garage is probably not much use to you in getting your lights changed, assuming that you do have the reversible plate. If you do find yourself in this part of the world the Lot, 46200, I would be happy to make the intro.
I have had sticky trip meters on other cars although not the B. I believe that this is sometimes down to the dial itself binding very slightly on the number wheels, after someone has taken the speedo out. Take the speedo out again, get hold of the dial and in the words of Ronnie Barker, jiggle it a bit. Another thing which worked for me many years ago is to turn the button through about 90 degrees and then push again. I think the end of the plastic rod can wear at a jaunty angle and simply slides off the bit that it is supposed to push. Not overly technical but it might work.
Just to pick up on your earlier points, if you have a speedo showing mph AND kph, then it is up to you if you change. The Contrôle Technique will accept it. Kph alone is a lot clearer but having the mph in place can be a useful reminder of what you doing. The simplest way of making the change is just to change the dial. I admit I haven't yet got round to that one although I will if I ever bet breathing space. There is a UK company that will make you up a dial marked up to your spec. and which you (or they) simply stick over the existing one. According to them, there is such a great variation in dials that you need to send them the complete unit. Not convinced about that. If you do decide on that route, let me know and I'll try to rummage out their details. Another alternative is to buy a non-working European speedo and pull the dial off it. Of course, you do realise that your present speedo showing that you have done say 90,000 miles will now suggest that you have only done 90,000 kms. Gosh, fancy that ! I leave that to your imagination.
I have read of many people worrying about fog and rear reversing lights but I didn't give it a thought when going for the C.T. My local garage did me a pre-test check over and they didn't mention it. Anyway, the car sailed through with only the headlights to done and re-inspected within 2 months. No mention of "little lights round the back". .Mind you the young CT engineer was drooling over the car and now wants to buy it, so he may have been a bit dazzled.
I have only just noticed that much of this has already been pointed out by Crachat so my apologies to him.
As most of us are probably aware there is already an established French Barchetta club, but it would be interesting for the moment within the cosy confines of these Anglophone pages, to know how many of us there are. Who is going to volunteer to collate or coordinate ? Take one pace forward, that man.