Dear Keith
I don't know when you were on Aero Flight but by 1964 all their aircraft used tailplanes that lifted downwards so I am with Mark on this one.
BTW I am glad to say that induced drag is not proportional to V squared (or we would all be in trouble). Induced drag increases as you go slower (as in not so fast) and is therefore proportional to one over V squared.
Regards
John