Steve - thanks. Yes its as you describe. I have just replaced the CFL bulb with an old style filament bulb and the unit now seems to be working....appreciate the help
Hoping someone can help with the following:
We have a tatty 1970s porch light which I replaced last weekend with a new, motion and night operated carriage lamp. Nothing fancy, just from Homebase. The light is switched on/off from inside the hall.
When I remove the old light fitting I find...