I have now had a look behind the dimmer base plate. It is oneway, but there are two three core cables coming in. One appears to come in from the ceiling light, the red being the live. The black is tagged red, and is connected to the other terminal of the switch. This appears as I would expect for a straight forward switch. However, what I don't understand is that that the other wire (note, all black wires are tagged red), which seems to come in from the wall sockets appears to have the red connected to both the live terminals at the sockets, and the black to both the Neutral. The red is wired to the live terminal of the switch (?) and the black to the other (with the central light return). This seems wierd, and I dont see where the wall sockets are connected to neutral. Either I have misread the connections, or the electrician was having a really bad day?[/quote]