^^Actually I got it slightly wrong. You either need a 3 pole isolator to isolate both the permanent and the switched lives plus the neutral or a 2 pole one and isolate the light too. Here's a wiring diagram showing both optins. http://www.vent-axia.com/files/pdf-downloads/441848.pdf The 3 pole isolator sounds favourite as you can safely work on the fan with the lights on. http://www.screwfix.com/p/mk-10a-3-pole-fan-isolator-switch-white/12319?cm_sp=Search-_-SearchRec-_-Area1&_requestid=1242125
@wvm started
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^^Actually I got it slightly wrong. You either need a 3 pole isolator to isolate both the permanent and the switched lives plus the neutral or a 2 pole one and isolate the light too. Here's a wiring diagram showing both optins.
http://www.vent-axia.com/files/pdf-downloads/441848.pdf
The 3 pole isolator sounds favourite as you can safely work on the fan with the lights on.
http://www.screwfix.com/p/mk-10a-3-pole-fan-isolator-switch-white/12319?cm_sp=Search-_-SearchRec-_-Area1&_requestid=1242125