Thanks everyone.
I am very happy to report that the Dragonfly has flown successfully and is 2/3rds the way through its Over 20kg testing. I could have completed all 6 flights in one day, as no problems were encountered at all, but I'm not sure that is for the best.
She flew very well indeed, loads of power from the Kolm EZ50's and a good turn of speed. Stalls were a no event with a very gentle drop of the left wing. 3-point landings should be no problem when i get used to her!
https://youtu.be/Nmc79lLFf5o