Front side lights don't work, looks like an electrical cct problem?

My MOt has failed on just one thing. The The front side lights which come on when the lights switch is turned halfway on, are not working. After examination, it looks like one side is completely blown and a new bulb and holder will be needed, however both sides wires also have no power leading to the bulbs, so its looke an electrical fault with a fuse. I don't want to pay £50/hr for someone to replace the fuse. How can I do this myself?