Yes Rod I think you are correct.If anyone has access to the BBC Archive DVD or Tape of the May 1976 Biggin Hill Air Fair,it starts off with Neil Williams in 'ZPH doing it from an inverted dive pushing up and then performing what JohnBlake called "flicking around in ever decreasing circles ending up you own axxe!!".It was then called Neil's Flying Saucer!!It does seem to be the time when these short films should be compiled together for posterity,as those times can not be got back!!!