Sussed it! Thanks for the insight DrSyn - the brackets . . . couldn't see for looking!
Anyway, another happy camper at Tarhuna Range, Idris. Mind you, the B(I)8 was well "in role" doing this sort of stuff - nice though.
By the way, the pics are not mine (although the kites are from my old sqd), they are from a very nice nav - Mike Richards - who probably never reads this board anyway!