Found it for you. It's on the UK passengers side, at the bottom, roughly where your toes would be. Makes a clearly audible "click" on and "ping" off.
Don't want to teach granny how to suck eggs but check ignition on and lights on beforetrying fog lamp switch.
Look in passenger footwell for a plastic cover held by two nyloc nuts. Remove the cover. Without having actually removed the cover, I felt up round behind this cover and along to the right, nearest to black metal cover (that does I-don't-know-what) by the tunnel. You can feel the rectangular relay body and I could feel it clicking too - when it works that is!