Thanks Nick, I didn't capture any, I literally just followed them around with my macro and flash until they were in focus...
, Sorry Nick, think I must have had a brain meltdown when I read your post.
I took 10 shots, I only managed to get 2 when they were fully in frame and that one was the best in focus of the 2.
So in the end I just picked a spot and something to focus on and just waited till they came into frame or close.