Useful thread, thanks guys.
From now on, I shall turn on the pitot heat as part of the pre-takeoff checks (and off in the after-landing). Assuming the d**n thing is working
Also, I will now remember to do my FRIEDA checks. A regular quick check on whatever part of the aeroplane is most likely to accumulate ice - e.g. fuel filler caps as Cusco suggests - can't be a bad habit.
Cheers
SD