Thanks for the replies from enthusiastic handflyers!
I still want to know if anyone has heard of a RVSM restriction by EU or western European airlines on hand flying above FL240?
I hope it was then and is now a myth, but I recall the noises being made when I was still in seat 0A until retirement.
Curious that there’s not been a chorus of voices saying it’s rubbish and quoting chapter&verse so the jury is still out......