Well there must be something weird going on over the Cairngorms then. Because I have had ice shedding off the props at -30 and building on the wings.
Why would you want to muck about with icing anyway?
Its not just "look at that" we have picked up a bit of ice.
When it starts building fast it really does lump on. In under a min you can boots banging away ice clattering off the hull off the props airframe vibrating like a bugger. I avoid it if I can and I have over 2000 shp to play with, pneumatic boots and prop heaters. I have still had my arse twitch a couple of times flying around the highlands due to icing and I know I am not alone.