Hi thanks in advance for all replies. Basically I noticed the lights to my new kitchen extension starter to flicker, there on a dimmer switch. After reading up on this a little I checked the wiring on the dimmer and all seemed correct. I replaced the dimmer switch plate onto the wall and the lights seemed to work fine and put it down to a loose connection. Anyway the problem has started again, and now seems to effect the whole house even though the lights to the kitchen are on a seperate consumer unit. The problem seems worse or more obvious when the dimmer switch is at its middle setting....does any one have any ideas on possible cause and solution before I call my sparky. Thanks again.