Mightygem, JohnDixon et al
I guess I didn't make myself clear. In no way was I suggesting that flying in freezing precipitation was anything other than a very bad idea, and I am well aware of the seriously nasty effects that could rapidly arise if one foolishly did so.
My question only related to where in the legislation etc it is written down as being prohibited, so as to provide an answer to those that have asked me "but where does it say that?" when I have told them flying in FP is verboten.
HC