2007 Clio no heater lights

Hi



Could anyone tell me how I access the bulbs that illuminate the 3 heater controls on my 57 plate Clio 1.2 extreme, as there's no illumination at all.



Couldn't be a fuse could it as nothing else seems to be not working and I'm guessing there's more than just those 3 bulbs that runs of that particular fuse?



Thanks in advance



Steve