Okay, work out! I think that I just have to base the delivery on the total cost of the order and not specify it in my coding at all ... That's what I did if someone else finds this with the same problem.
Log in to your Paypal account. Go to the "Profile" tab at the top of the page and in the "Sales Settings" section click the "Calculation of Payments" link and follow the instructions to set, for example, £ 0.01 - £ 9.99 delivery £ 1.15, £ 10, 00- £ 14.99 shipping ¥ 1.95 etc. etc.
Thank you for your help!
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