Re: I'd have to ask...
'my flying school required that all pupils be taken up in an unpressurised aircraft to a height of 10,000''
Which is generally the maximum height you're recommended to fly without oxygen, so I'm a bit stumped why they thought that would be useful training. I've been higher skiing.
Of course, as has been pointed out, they already had training in recognising hypoxia, it's a NATO requirement, but if the likelihood of an emergency has increased it may be a good idea to increase the training for it, n'est pas?