Hello people

I have a 2006 Citroen C4 1.6HDi. A few times recently when the headlights are on, the fof lights have come on of their own accord, usually the fronts, but the backs have done it too. They can either come on and stay on, or flicker on and off. Switching them on then off with the switch doesn't seem to help. I have squirted Servisol switch cleaner into the switch and the problem persists. Any ideas where to look first? I had thought maybe a relay? Which one...? There doesn't seem to be a fog lamp fuse going by my handbook - and really need to sort this with darker nights approaching. Is it going to just be an auto electrician visit? I'm near Carlisle if anyone has a recommendation.

THanks in advance!