Same thing on my mk1 tin top. reverse lights dont work. I spent ages trying to get them to work, same thing with the switch on what must be a replacement gearbox. I was going to wire in a dash board switch for the and when I checked with a mechanic whether it was acceptable, he said dont bother as it will pass with out them. He was right, its been through to mots now and passed with them not working. Still cant see where I am going in reverse at night though! Mind you, as you know, in a mk1 with stock headlights its much the same when going forward.