Thanks for your response Christi. Unfortunately now I have an error trying to log in to wp-admin at all, so I am taking everything down and will start afresh.
I do have a question – I have a Full Backup of my website in a tar.gz file, and I also have MySql backs. I restored the Msql backups to the server. I have expanded the Full backup and have it in Filezilla.
So to start afresh, do I re-instal new copies of WP onto the server and then do a backup (it will be through FTP) or should I just FTP everything up and then update WP). I was running the latest copy of WP and my theme at the time I was hacked so my brain is thinking this through as I type – perhaps I should just FTP everything back to the server?