Thanks so much Averil for taking the time to look up the Censuses!
The 1901 is indeed my Great Grandparents, shows that Johanna was living with them, but married 2 months later, as you have confirmed with Marriage record.
The 1911 Census is a different Yeoman Family, very confusing because the a couple of the names matched however I have found Johanna's 1911 Census, which shows them living in Cardiff Wales, Harry being a Shipbroker and 3 sons.
I can't tell you how much I appreciate all the help...we live in Canada so the UK research can be trying and confusing at times, particularly when starting with absolutely no family information or history.
The Margaret Clegg I'm looking for was perhaps born in Isle of Man and then moved to SA. The relationship between her and Johanna is probably friendship based rather than family.
The search continues...THANKS again!
Janis