Help solve a mystery???

This thread is also running on Pprune where it has received some interesting responses. But the mystery still remains.
I have had Off forum discussions and the conclusion is that the Heron pleasure flight MAY not have been at the 50th event at Abingdon (although I was there) but COULD have been at the Batle of Britain Show at Abingdon in Septemebr 1967. For reasons I won’t elaborate on now , it could ONLY have been ONE or the OTHER !!!

Can anyone please help…..???

The reason for starting the original thread is to find the Reg of the Heron as I am collecting images of significant a/c for me personally eg First flight, fisrt fixed wing solo, first helicopter solo etc etc.

Yours in anticipation

Bravo533