AnFi - with the addition of this:-
"Much of the area was prone to widespread low cloud, poor visibility and patches of freezing fog. Cloud bases were in the range of 100 ft to 400 ft agl at 0800 hrs."
I don't think you can say with certainty that there was no possibility of meeting icing.
Of course you can say just because the met briefing says XYZ doesn't mean you are in it, so from that I agree, but I don't plan my flight with the mindset "what the hell I'll have a go and stick it in a field"...
If thats how we are going to advocate we go flying its not for me.