I have an Electrician re-wiring an old house. In the Kitchen there are two sets of 'spot' lights each on their own switch. There is also a pantry light. The two kitchen lights and the pantry light are on a 3 gang switch. The electrician told me he used a 3 core & E to wire up the 2 kitchen lights rather than 2 lots of 1.5mm. I asked him to explain how that works but he lost me half way through. Is there a diagram of how this circuit works somewhere (or can anyone provide me with one) I have looked at the wiki but can't find one. He insists this method is commonly used.