Like Tiger Moth G-AOBX which once graced the Hampshire skies at 48000' on one of the sites. Apart from the Loon balloons and the odd U-2 (and one of NASA's RB-57s) I've not seen anything else above 47000' as I recall...
Actually, I see Steve Bohill-Smith is a trustee of the group who operates her - was he not a Concorde captain? Well used to getting up high...
Just looking - Cub G-BVIE is reporting 48000' over Essex as I type. Must be a very good day for thermals!
