I had great difficulties getting the payment gateway cycle to start after completing the Cart and pressing Pay.
Evenually TT found a bug in version 8 that prevented the payment going onto the collect card details page. If anyone has this problem and using templatetoaster for their template design upgrade to V8.0.0 19963
This issue was found in the orderdone.php file line 16 deleted. I attach a working template for anyone wanting to examine or modify.