Hi Jason, thanks for your help.
I add a product to the cart, checkout and when I get to Paypal for payment, I always have to sign in, even though Paypal Account Optional is selected in the Paypal setup. The option to Pay by Credit Card without signing in is just not available.
I have cleared the cache and tried again three times without success, so I am wondering if there is something in the code that is being sent to Paypal by eCart.
I just read that express checkout requires a Paypal account. If this is the case then express checkout is of no use to me, I need something like Paypal Payments Standard. I did not see this as an option on setup.