I'm fitting an extractor fan as supplied by Screwfix. The installation instructions require a fused, double pole switch to be placed outside the bathroom. Fine. I am taking the supply from the existing lighting circuit. My question is this; 1.Is there a DP Ceiling switch with a fuse that I can use inside the bathroom, 2. Does the switch outside (or inside) the bathroom have to be fused, 3. Are the fan isolators supplied by screwfix fused. More than one question, I know, but any advice would be appreciated, thanks.