Thanks for the replies, I've only had one go in a buggy wih a seatbelt & that was at easter, so you've given me something to think about.
I thought it might be interesting to compare setups, what are your own seatbelts like, do you strap yourself or the buggy to the kite & on an open or captive system?.
No matter which, I'll make sure I see someone on the beach before lift off.