Hi Don, thanks for getting back to me so quickly.
I recreated the test file last night (phpinfo) and it seems to have started working, so I think it may be an issue with the PHP code.
Last night I was using <?php phpinfo(); ?> and got the error.
Today, I tried
<?php
phpinfo();
?>
And it seems to be working fine.
Some of my other PHP scripts though are still giving the same error though, when they were working perfectly last time. I'll look into this further and post back the info you've requested if it still fails to work.