I had that very flap switch gotcha as a low hours PPL in the very aircraft that poor lad at Southend was killed in last year. Looking back nobody ever warned me about it so I wonder if there is a lack of general awareness of this problem. Perhaps we should try and raise awareness of the potential dangers.
Regarding the 16:1 issue - I would be surprised if there are 16 times more
Cessna 150's in the Uk then 152's.
Remember there are lies, damn lies, and statistics. What you need to do is look at each incident and try and draw comparisions as has been hinted at - ie base to finals turn with the flaps inadvertently being raised or how many of the accidents have involved 150 aerobats doing aerobatics, continental more prone to carb icing etc.