Not quite what the NASA airframe icing courses say but I won't argue with your JAA ATPL met theory; my IR came on the back of a fag packet
I think you are describing more conventional icing.
Here's some light reading:
http://aircrafticing.grc.nasa.gov/courses.html
http://gltrs.grc.nasa.gov/reports/20...000-210058.pdf
and finally, put q23g763mxxn3knp8.pdf into google (sorry the URL looks a bit weird)