https://www.wikitree.com/wiki/Gurney-356Quote from that;
Mary Burrell formerly Gurney aka Grainey
The birth record for daughter Martha Bessie (known as Bessie) shows Mary as a Londoner.
Strange that this person is "Mary Bridget" on birth records for children 8, 9,10,11.
I may be clutching at straws here but;
1851 in we have Central London District School ;
Bridget Greaney 5
Martin Grainey 12
John Grainey 9
All have pob as not known.
GRANEY, BRIDGET, Mothers mn SHERIDON
GRO Reference: 1846 J Quarter in SAINT LUKE MIDDLESEX Volume 02 Page 333
GRANEY, MARTIN mmn SHERRIDEN
GRO Reference: 1839 S Quarter in SAINT LUKE MIDDLESEX Volume 02 Page 280
1891 Martin Graney is born c 1839 Clerkenwell
FreeBMD has a 1838 Marriage;
Michael GRANY/Margaret SHERIDAN on same page
Image of the Marriage is on Anc