Heigh ho. The fluorescents in my office not having worked all morning, and having forked out 47€ on a new LED replacement yesterday, I decided to install the thing this afternoon. As a prelude to taking the old one down I undid the casing, took the tubes out and popped out the plate that carries the tube-holders. As I did so, the live wire slid coyly out of the terminal block. It wasn't clamped in by the wee screw.
Fecking div moment #1.
I backed the screw out, tidied up the end of the wire and shoved it in again, tightened the screw down on it and gave it a tug to make sure it was anchored. Reassembled the unit, switched on and it worked. Yo! (But 47€ spent on nowt... well, it can go in the cellar.) Put away tools & hop-up, got myself a cuppa and sat down at my machine. The light went out.
Fecking div moment #2.
A while later it came on again, and so far it's stayed on. Watch this space.