I have bought a simple Wickes bathroom extractor fan to replace my noisy old Manrose one. I thought it would just be a case of taking off the old one and fitting the new one. However, the old one has 3 terminals - marked live, neutral, and switched whereas my new fan only has 2 terminals - live and neutral. 3 wires - red, blue and white come out of a small isolating switch box. On my old fan, red was connected to the live terminal, blue to the neutral, and the white to the middle "switched" one. Can anyone advise me on how I should connect these 3 wires to my new fan? I tried blue to neutral, red to live, leaving the white one unconnected and I also tried it with blue to neutral, white to live and red unconnected. In both cases, when I pull on the light cord, the fan does not work.