Oh I do, I beg your pardon. It was in my cpanel, but not on the files on my computer for some reason.
I have changed this part to look like:
Code:
// Define the webserver and path parameters
// HTTP_SERVER is your Main webserver: eg-http://www.your_domain.com
// HTTPS_SERVER is your Secure webserver: eg-https://www.your_domain.com
define('HTTP_SERVER', 'http://crookedhalo.com.au');
define('HTTPS_SERVER', 'https://crookedhalo.com.au');
// Use secure webserver for checkout procedure?
define('ENABLE_SSL', 'true');
And it seems to be working. 
Now for my next question, I noticed in one post about a similar kind of problem that they had they were told to write a .htaccess redirect or something - do I need to do that? If so, how and where do I put it please?