I am putting extractor fan in bathroom. It's a timer version so have wired it to an isolator switch. The confusion comes when I try to wire it to the bathroom light pullcord. All the videos ECT say wire into light rose. I have checked pulled and all I have is a red and black wires going to switch. Can't see a rose at all. It might be in loft but loft is very small and right and I'm not a small chap. Is there any other way to wire from isolator to live circuit.