bring a 3 core 1.5 cable or flex from your bathroom light fitting, add a sunken metal or plastic surface socket box near to the fan location , and add in the cable or flex , run another flex to the fan from the box,you should now have two cables at the box, 1 from the fan and 1 from the light. fit a 13amp spur unit to the box , take out the 13 amp fuse and fit in a 2 amp fuse. connect up the fan and fit its cover, then connect up the spur unit. with the power off connect up the cable at the light , neutral to existing neutral bar and same with earth , connect the live into the lights switchwire , then power back on and away you go.
michael coleman
March 2007