Thanks Fireman 22 for your reply. Delmel, I am using low voltage lights with a dimmable transformer. One more question...I asked an electrician if I could pick up from the fused spur to supply a twin socket as well as my lights. He confirmed that the cable in and out of the spur was mains, although it is on an independent 'central heating' supply, (it has it's own trip in the consumer unit). He told me to treat the 'back' of the switched spur as a connecting block, and to run my new socket spur from there, unswitched. Then I should run my lights off the load, or switched side of the fused spur. The problem is the amount of wires into too little space, mains in and out, new spur in and out, and lights in and out. Since the lights don't need to be fuse controlled at this point, would I not be better off using a big 30 amp junction box with much more space for the wires?