Thanks for that heads up Green Flash, caught the programme this time - brilliant. Particularly impressed with the pilot (forget his name) a typical quiet, unflashy guy, obviously at the top of his trade, the only resemblance to Tom Cruise being his slight stature! Sympathised with May's claustrophia in the helmet - I think it would freak me out as well, was always glad to get my bone dome off at every opportunity.
BTW what sort of gear was worn by the Canberra guys when setting altitude records eventually over 70,000' in the 50's in pre-U2 days - something similar presumably?