Wiring an extractor fan

[V8OW]

This is probably a relatively straightforward question, but I'm trying to work out what's going on.

My electrician wired in some new lights in my bathroom, and did it so that I could add an extractor fan once I'd drilled a big enough hole! I've got what I presume is a fused isolator switch, but I'm not sure how it needs to be wired up to the extractor.

I'm not going to do it myself unless I know what I'm doing, but thought I'd see if someone could explain it to me.

Edit: the surface boxed is going to be replaced with a flush box!

Thanks

[V8OW]

Thanks - I'll try and see if I can make sense of some wiring diagrams!

[V8OW]

Strange... maybe I'll get my electrician back around to wire it up then!

The switch for the light is on the outside of the bathroom door (powers two led ceiling lights), and this box was fitted close to where I was planning to fit the extractor. I got the impression that once I'd got the extractor sorted it would be easy enough to connect up, but perhaps he was planning to do something else.