Hi, l have just purchased a replacement double pole ceiling switch for my power shower. The original one had two earth connections (there are two pairs of two wires =4 wires protruding from ceiling) but the replacement one only has one earth connection. Any ideas what I do with the 'extra' wires. I am a competent diy-er but prefer to stick with basic electrics exchanging like-for-like, so please don't get too technical with your answers 
