Philip, Brian Lawson's registered births index has:

Florence CALLOW [born] 13 Jul 1898, [regt] Ramsey [father] Not given, [mother] Mary Jane CALLOW.

Mary Jane CALLOW [born] 19 March 1879, [regt] Ramsey, [father] Not given [mother] Jane CALLOW.
This doesn't fit with her age given later as being c.1876, nor with her mother being Caroline Looney. (But pre-1878 is usually too early to be in the registered births index.)

Did you decide that Mary Jane's mother was Caroline because of being a granddaughter in the 1881 census, or was there additional information?

Sue