Hi Guys,
Fortunately Bad Person seems to be trying his luck elsewhere. Since I don't have a fixed IP address, I installed this:
http://wordpress.org/plugins/wp-login-security-2/
It saves the IP address from which Administrators login and if an administrator logs in from a new IP then it sends a one time password to the account email, (which the bad guy won't receive)
I've also explored some .htaccess options which I may put into effect in due course
Thanks for all your help(s)
BWs
James