Just had a re-read of your post 120 Brakedwell. Fascinating stuff and to have the photo's to go with it. Super.
You would know more than most about the superb slow flying qualities of the TwinPin. Here's another note from one of my diary's from 15.6.61 at St. Athan when I was a 'Boy Entrant.' "XN321(dayglo) Tannoy tests - one & a half hours." What I didn't note down, was that the wind was as usual blowing a good westerly and it spent most of that time stationary above our billets on East Camp!