Thanks for testing it out. Apologies l neglected to mention that I reinserted checkout_success.php on line 971. The reason for this is so that the checkout_success.php comes up and not cart.php as the site is live. The gateway provider sends out a transaction confirmation which I will use temporarily so at least they get a receipt as opposed to the detailed email from PowerStore; however this site doesn't send the replica of the checkout_success.php page and only displays the cart.php page.
All other notifications work fine. For example, registration, forgotten email and shipping.
One my main site when I removed the above from line 971 it meant that both the email notification from the site of a successful purchase and the checkout_success page both worked and naturally I modified the same site to set this one up.
I'll make the change on Monday so you can have another look if you don' mind please?