Never mind, my host customer service suggested resetting the site. That worked, thanks anyway.
I’ve tried to upload my local version of wp-config.php again & keeping getting ‘Error: Network error: Software caused connection abort’ back. I’ve also noticed that the current server wp-config is totally blank — could that be part of the problem?
For some reason I can’t get the wp-config.php without the script debugging line to upload to the server now.