You'll struggle to get a co-operative reply on here Knighty, these electricians are a defensive bunch! Only Part P registered electricians should be allowed near a 3 volt battery, let alone mains electricity! No matter how intelligent you are, how much you know about or can learn about wiring, you must not under any circumstances do any wiring. You will kill every living thing that comes near the premises you have contaminated, just because every other trade can be carried out by a reasonably skilled person, don't even think this applies to wiring. Of course there are potentially very serious consequences if it is not done correctly, but not every un certified person is an idiot. Now I wait for the flack!