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Her birth was registered in Luton in the Dec quarter 1905 vol 3b page 360 (per
www.freebmd.org.uk). If you purchase her birth cert at
http://www.gro.gov.uk/gro/content/certificates/ you'll get her parents' names, including her mother's maiden name.
In 1911 she appears to have been living in Luton in the family of W.F.G.Peck 48 b Luton:
J.W.Woombell boarder 40 Married 14 years, 4 children, 3 living, Carman, b Nottingham
Lilly Woombell boarder 13 b Luton
Glaids Woombell boarder 5 b Luton
Winnie Woombell 2 1/2 b Luton
Is JW connected to Albert living in Luton in 1901?
Albert Woombell head marr 24 Coal hawker b Nottingham
Kezia Woombell wife 24 b Luton
And is this JW living in St Pancras in 1901?
John Woombell head marr 30 Coachman b Nottingham
Elizabeth Woombell wife 25 b Luton
If so, where's Lily age 3? What appears to be her birth was registered in Luton in the March quarter 1898 as Edith Lilian L Woombell.
There's a marriage in Luton in the June quarter 1897 where two of the parties on the page are John Webster Woombell and Edith Elizabeth Young. But there are quite a few inconsistencies so to be on the safe side I would still order Ivy's birth certificate
David