From the keyboard of Dr Jan

I picked up a PIR (passive infra-red) sensor at B&Q a couple of days ago. It doesn’t have any lamps attached, it’s just a switch for controlling existing lights. It’s the same unit you get as part of those halogen security lamps which turn on when they detect movement and it’s dark.
I’ve mounted it inside my garage and connected it to the garage light. So now whenever I go into the garage, the light comes on automatically. Hurrah!

All this goodness for about a tenner. Can’t say fairer than that