The good Cap'n Biff has eventually replied to my email to him, after 13 days (he's obviously a busy man) - and he has advised, that he'll be giving a short talk at the Royal Aero Club, "Old Timers Meeting" (along with other featured speakers), at noon tomorrow (26th Feb, 2010).
He has very kindly asked me to join them, and I am presuming that this is a "general public" invitation, although he hasn't specifically stated that.
His Beechcraft Staggerwing will be on display outside the Aero Club, along with Kevin Baileys Stinson Reliant. I'll be taking the camera ....