new problem (together with the delivery charge session not going to paypal)
Sorry for all the posts, im making progress but find a few other issues.
I had the system working, not sure which code i changed on the confirm page as it wont post to the success page. so something preventing it there.
also on the paypal page (sandbox) it doesnt show any order details (actually this pay a better touch - i think it stopped displaying order info here after i added "order description" on the paypal server behaviour.
and of course the other main issue is that when the roder was displaying on paypal it wasnt taking into account the newer delivery price option that customer selects on checkout page. (even though the info isnt displayed on paypal om worried that paypal would still be charging customer the wrong amount as before it was showing the previous delivery cost option (on the main website the costs are showing correct - just paypal not using correct delivery cost - only using previous from a previous order)