Awesome! Thank you. The module is installed now. It was a case of changing every reference of TABLE_xxxx in the file as you suggested.
I've just been running a few tests on it and the process has stalled on the checkout_confirmation.php page. The "Finalise and Pay" button, underneath the T&C's confirmation, is missing when you reach this section.
This was a similar issue on the RBS Worldpay Redirect module on V1.0.7.14, but the update to v1.0.7.15 solved the issue it seemed.
It's hard to say whether it's working 100% as it's not being able to connect to the Cardsave hosted payment service without the "Finalise and Pay" button.
Thank you for the help so far.