Well, I finally got all the lights working, but...
The Där fittings, although attractive, have some issues. (These are the lights:
Secondly, the glass varies markedly in thickness, and so in colour/translucency. We noticed this when trying them out. In total we have nine glass shades (six from the wall fittings and another three for the ceiling fitting). Although the same length and diameter, I thought it interesting to compare their weights to see how much they differed. Remarkably, the lightest was 58g, and the heaviest 114g! How can they vary so much, with one being almost double the thickness of another?
Finally, at least 10 - 12cm of cable is required for connection as the shape of the fitting, and position of the fixed terminal block in it makes it almost impossible to get to the block screws and tighten them down properly. It's not a clever design if they are being used to replace old fittings and the cable is relatively short. I wonder how other fittings - not just made by Där - are in this respect if used to replace older fittings.