Helopat wrote"If we've got all the functional de-ice and anti-ice kit, we can operate down to +1degC in visible moisture."
That must be a typo , with all the de-ice and anti-ice functional you must be able to operate at temperatures well below freezing.
It has been my experience-with the exception of engine icing- that you don't pick up ice in visible moisture if the temperature is +0.1 C. I have never picked up icing flying in snow at temperatures below 0 either.