I don't think the fact there was nobody else on the road beside you and this copper is of any relevance really. Safety advice and warnings are given out by the Police as exactly that. What you're doing basically is questioning his advice. You got away with advice; you're lucky! The only reason you'd want to find other people who've had it happen to them would be to check the legitimacy of the officer's word.
The highway code you have been directed to says:
"You MUST NOT use ANY lights in a way which would dazzle or cause discomfort to other road users, including pedestrians, cyclists and horse riders."
This is a general rule in addition to the rule re fog lights. So, whether you feel these are fog lights or not is irrelevant. If a Police officer, in their judgement, feels that the lighting you're using on your car is inappropriate for the conditions and "potentially" in contradiction of this section of the Highway Code, then he can pull you up and have a word with you about it.
After reading all the replies, I'm interested to know what you'll take from it. I don't think any of them have given you the answer you've really been looking for but the real question is will you ignore the officer or not use them unless necessary in future?