That's because I decided to try re-uploading the files and folders via ftp (after nameservers had been changed) - you must have checked it just before I updated the wp-config file.
Some of the original content is now showing on the site (e.g. flower images on sides), but not much of it. And now the login doesn't work! - it just goes back to the login page after entering correct login details. So I can't access the admin area for some reason. Any ideas?
Thanks for all your help!