Thanks racefan i found that banning the blogger site helps but it's better if you can ban there computers IP Address, this is were PHPBB falls down on it's security not showing the IP address of members to the Administrator when view there profile.
But i might have solved that, found a free forum download that i have set up in my new members only section, it give's the full IP address and survice provider of the member http://aliensanonymous.org/forum3/ it's a work in progress .