If anyone else wants light fittings similar to those that Yngmar advertised at the start of this thread, I've got a box full (14 light fittings) that I don't need any more.
Where original switches remain, they all work, on others the switches have been replaced with similarly sized and more robust ones obtained from Maplin. Most have warm white LED replacement lights within, and all will need to be polished.
Make an offer, plus postage or come and pick them up in Colwyn Bay.
All proceeds to go to the Lifeboats.
Since writing the above, I've found a few more light fittings, and parted with some. Currently I have 13 remaining and I'm asking £50 for the lot collected, or plus postage if they have to be sent.