Thanks for that awesome reply (and the speed of reply).
I'll try your suggestions and get back.
Re #4, I did see the adding invoice details to the thank you email , but there didn't seem to be a way to reduce the number of emails. No matter what I do there will be one email sent with the download link and another with the invoice. Is this correct?
(I'm trying to reduce the number of emails clients get but I'm struggling. At present for a simple order for one ebook they get two emails from you, one from Paypal and two from MailChimp.)