It proves that the light switch is working fine if the fan turns on.
Try looking for a loose connection in the light fitting
How would be the best way? The fittings are recessed and only the bulbs are accessible for changing them.
You will need to pop them out and find which is the first to be connected and then check the power there
So do I take them all out then try each fitting individually with a bulb?
If you can pull them out the ceiling and follow the wiring back to the switch - if none of them are working and the bulbs are good then it will be the first one on the loop from the switch
So do I tke them all out and replace each one at a time to see if they work?
So do I take them all out then try each one individually?
Sorry i replied a few times because the answers didn't appear on my screen.