I've just moved and the ceramic set up failed in the new place. In the end it was the bulb- guess it got damaged in the move. Its a pain to get it out of the guard, but looks like you are olut of options: remove it, place it in a nother socket you know works and see if it gets hot- if not a blown bulb/ wiring issue. Then try a light bulb in the viv one to see if it lights up: if its live and if that trips the circuit in which case you've damaged the viv set up in the move.
If you're not confident fiddling with electricity get someone else to do it though...! Best of luck.