See Doc's projects 'wiring a ceiling light'
the looped lives go in a spare connector block not connected to the actual light, also you do of course know that altering the wiring in a bathroom is reportable work under bldg regs 'part-p' as explained in 'Projects' section.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!