...and bought HitFilm 2017
Added the serial number to the demo version, rebooted the app, then everything was magically unlocked , and I can export without limitation. Excellent! My RedGiant plugins also appeared, which is even cooler. Probably going to need to look at some tutorials for Boris though...
My thanks to everyone who helped with my endless questions while I was working out which version I needed to get.
Now!!!!! Editing can begin