In reply to John Blackbourn.

Thanks John

This section says it all...

"It has been stated in previous tickets, "leaking" of the username is not deemed a security issue by WordPress.org, as it's a conscious decision to use the username as the slug in the URL, If you don't like this default behaviour, there are plugins in the repository which allow you to change the url format to your preferred layout.

Instead of attempting to provide security by forcing people to guess your username (Which btw, is incredibly easy in most cases, as people are not that inventive) you should be focusing on improving passwords, and/or considering 2 factor authentication (ie. Google Authenticator) if your passwords are known to be insecure/weak."

Appreciate the help guys.