Thanks guys,
I checked the lines at home last night and they seem fine.
I also pumped the kite up to check it for leaks or tears and it looked good as well.
I did notice I have a hole in the hose of the pump so whether that had some consequence on the pressure in the kite I don't know.
That is fixed now so the next time I'm out we'll see how it goes.
Thanks again for your invaluable advice.
Hope the winds are good to you this weekend.

cheers
Lorgra