OK, I'm ex military, so I can be on this site, but this is a civil story. It was a very bad weekend for icing conditions in the north of England. A Shorts 3-60 came down in a field just short of East Midlands through icing. 48 hours later, another Shorts (me) got airborne from Leeds for Belfast. When the machine stopped climbing, despite still having T/O power set, we initiated an emergency diversion to Manchester. I sat there, watching the airspeed decay and realising that at the same time the stall speed was increasing due to the spoiling of the aerodynamics. At some point these speeds were going to coincide. We crossed the threshold at Manchester with the throttles firewalled. I suffered alopecia nervosa for several months afterwards.