Ok finally happy
after more searching around I have fixed all the issues.
I had to modify sshd_conf
and restart sshd
I ran the rkhunter -c scan again it returned no warnings and this time I did not receive the email, meaning the hourly scan now will stop harrassing me by email unless there is a problem
Thanks to you guys for some of the previous posts which did eventually give me clues as to sorting out what he underlying issue was, as searches on the warnings generally show up more confused souls lol