My initial scan revealed 4 infected files which the plugin repaired.
A scan on Google says the site isn't blacklisted and a scan on the domain root (mydomain.com) using Sucuri SiteCheck says the site is clean.
However, if I perform the same scan on the WordPress folder <mydomain>/wp/ then the Sucuri SiteCheck says:
Suspicious conditional redirect.
Redirects users to:http://order-safely-online.webs.com/
I also scanned with Vurustotal which also shows the same redirect.
I can't see anything suspicious in the .htaccess or index.php files in the /wp folder - is there somewhere else I should look?