rear fog light stopped working

hi, need some help, my fog light on 88 gti cabby has stopped working, i have used a test light and connected it to the rear of the switch i get some power off the blue/grey wire when i put my headlights on but am getting nothing from the yellow/grey wire white/grey wire or white/yellow wire, no matter what possition the switch is in, the little warning light is not coming on either.

check fuses mate but sounds to me like switch could be knackered

i have checked all fuses in box and have removed all block connectors from back of box to make sure the contacts are good and clean, think it is pointing to switch. thanks for reply matey.

no probs mate should be a straight forward fix