Further to my request for assistance with a lighting switch in the wanted column (thanks Dave & Fred) I then discover my headlights are the old P45T fitting with ancient incandescent filament bulbs installed.
There are adapters available which enable you to use a H4 bulb in a P45T headlamp but I've read that they don't work very well. Has anyone any experience of them please?
For the time being I've bought a couple of halogen P45T bulbs which are the same 40/45W rating as the original bulbs but I hope will be a bit brighter.