We had a new consumer unit installed earlier this year to replace a fifties fusebox. We also changed the bathroom light from an old thing with an integral heating element to a 3 spot halogen job. Everything was fine for a few months until the light was switched on, there was a brief flash of light (from the bulbs) and darkness ever since. I have removed the light fitting and tested it elsewhere and it works fine - one of the bulbs had blown. The consumer unit has not tripped but the light refuses to work in the bathroom. Any ideas?