How do I take a cut off the bathroom light source, to install an extractor fan?

Im wanting to installl an extractor fan with a timer, connected to my bathroom light, so every time I switch the bathroom light on, the extractor fan will switch on too. The trouble is I dont quite know how to take take the power from this switch. Do I take just before it reaches the light itself? Answers would... show more Im wanting to installl an extractor fan with a timer, connected to my bathroom light, so every time I switch the bathroom light on, the extractor fan will switch on too. The trouble is I dont quite know how to take take the power from this switch. Do I take just before it reaches the light itself?

Answers would be greatly appreciated.

Thanks,

Steven
4 answers 4