Hi Jane
I think that it could be Frederick sr baptism as his age on census seems to change.
According to census records they lived in Nottingham St Mary's on the 1841 census they were living in Millstone Lane.
Thanks for looking anyway, looks like i will have to get one of there childrens Birth Certificates to find here maiden Name, one born after civil registration.
Your help is much appreicated
Regards Bev