Thanks Waterbug.
Having a one-line system sounds simpler and probably less for the crew to sort out. I guess the downside is there is an aweful lot of line on the tramp when the sail is up - perhaps feeding that into a bag in loose coils could be a solution.
I have never sailed anything with a kite so the whole thing is going to be a new experience. I would be better to start simple and then experiment with more complex systems at a later time.

Regards
Chris