Thanks for the replies.
126.9 - hmm, fairly severe misunderstanding there.
No-one's talking about reclassifying an aircraft, but I did say "flying to a higher category", meaning "flying whatever speeds you like, as long as you apply the correct minima". Hope you recognise the similarity between those two quotes, mine & yours!
Unfortunately, still confused. Your comment re ATC makes sense OzExpat - have you ever actually told ATC you're operating to a higher category speed / minima?
O8