I have mentioned this before but not the time and place but seeing as the display envelope seems to be changing it may be worth another mention. Six weeks ago 558 was practicing at Scampton, at the end of the routine it flew fast down the runway from the A15 end before climbing out over the viewpoint. The climb out was at 70 - 75 degs. and before top of climb it flew a half roll and then levelled out inverted, another half role was carried out before it flew off the right way up. For once I was dumbstruck, I was involved with the Vulcan fleet from 1968 - 1980 and have seen lots of displays but nothing came close to the manoeuvre that I saw 6 weeks ago, and yes, I do know the difference between a half role and a wing over.