I’m going to close this thread because I have fixed it.
What I did.
1) Deleted everything using File Zilla
2) Deleted all MySQL databases and user names
3) Used C Panel to make new database and user names
4) Re installed WordPress making sure wp-config.php renamed according (removing that sample bit) and editing inside to right database name etc
5) Uploaded WordPress using File Zilla to new directory of public_html
This video helps to explain the process very clearly:
Lessons going forward:
BACK-UP regularly. It isn’t hard to do so. But if your in my position now you have to download the damn theme, plug ins and upload pictures, make pages etc again. Pain in the butt.
The uploads folder is exactly where several known hacks store backdoors and backup copies of malicious code. NEVER upload hacked wp-content to a clean site!
Hopefully your story has inspired many to backup their installation regularly, including the wp-content stuff. It’s possible for almost anyone to get hacked eventually, often through no fault of their own. Backups — just do it!