Thanks Kgarrad,
How often one gets carried away with the reference dates, I should know I fell into the main trap, years ago I went to the record office and the officials told me almost everyone first time looks at their own reference...…….sometimes only to look around in horror as they cannot find their name under their birthday, because as you reminded me its when it is registered that you see your name, I think you get about 3 months to register.
so, I am a lot clearer Carla was born 1951 say ond and may have been registered 1952, this does enable me to get siblings in.
Many thanks to all