The simple answer is icing will not occur so long as you avoid clouds/mist/fog. Given that students have to avoid all 3 anyway this shouldn't be an issue. Enjoy the flight MrB
Clouds are OK, (on the outside), its the wet stuff coming out of them you want to avoid. Otherwise, I agree.
Caveat: You can get frost forming outside cloud and precipitation, if the aircraft is colder than the moist air around it, eg descending from height. But this QXC is at 2,000ft so I cannot see that happening.