Thanks for the posts everyone, havn't been ignoring you all - detailed replies will follow in a day or so - unfortunately still clearing up after having to call out of these light making devices. The blur on the image is because it was speeding to sparky-central after a short circuit caused a water-heater timer to catch fire. Fortunately our smoke detectors are tested regularly and worked as they should do, so everyone got out quickly and safely.

Pinky - you left the lens cap of your mind on again.