kitchen downlights failed

[highlander2]

We have 6 recessed downlights in our kitchen. Not sure what voltage, but they were recently installed during some refurbishment. They are operated by 2 switches, one is a dimmer. Recently they began to brighten & dim and then finally went out. None of the circuits tripped. But around the same time I noticed that the extractor fan for the adjacent downstairs toilet doesn't work. I haven't started changing bulbs yet 'cos I assumed it so unlikely they'd all fail at same time. Can anyone help? Thanks.

 

[Steve]

Loose connection somewhere on the lighting circuit. Trace the wiring back along the line. Lights are done as a radial so it sounds like the kitchen and downstairs bog are last on the circuit. Look in the downstairs bog light fitting, i'd suspect this first.