Fields around 0’17" in Ben’s video - coordinates in the 12th post. 
And a lot of it is having another pair of eyes (and a tall bloke to poke your quad out of a hedge 
), so I can thank @Yith & son for that.
The Darwin79 is promising. I could probably do with some slightly lighter 3S’s for it, although it seemed to be coping with the 650mAh 4S I saddled it with.