K10's don't have front fogs, you've got driving lights that should come on with your full beam, you've got dipped, full and side (perhaps with dim dip too) oh and chav lights but I doubt you've got fogs unless they're an after market fitment.
The officer involved probably wasn't traffic and knows little about cars and so should perhaps not pulled you up on the matter, but stuff like this is usually a good marker to stop a car and push for other offences.
Remember in the UK the police need no reason to stop you other than to check your documents, appending silly lights and loud exhausts to a car merely makes you an easier target.
