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Looks like Frank's birth:

Births Jun 1910 (>99%)
BRADFORD Frank Cyril Hackney 1b 421

1911

BRADFORD, James William Head Married M 40 1871 Bricklayer Saffron Walden Essex VIEW
BRADFORD, Mary Wife Married
4 years F 23 1888 Bermondsey S E VIEW
BRADFORD, James Son Single M 16 1895 Bricklayers Labourer Saffron Walden Essex VIEW
BRADFORD, George Son M 9 1902 School Clapton Park N E VIEW
BRADFORD, William Son M 3 1908 Leyton Essex VIEW
BRADFORD, Frank Son M 0 (11 MONTHS) 1911 Clapton Park N E VIEW
BUTLER, George Boarder Single M 21 1890 Vegetable Cook Peckham S E VIEW
RG number:
RG14 Piece:
1095 Reference:
RG14PN1095 RG78PN36 RD11 SD3 ED22 SN91

Registration District:
Hackney Sub District:
Central Hackney Enumeration District:
22 Parish:
St John At Hackney

Address:
156 Glynn Road Hackney N E County:
London

James was born in Saffron Walden in 1869, but moved to London with his first wife Eliza Jane Mallion. They had George and James, and although not mentioned by the family in any records or talk, the records seem to show there were two girls, Annie and Ethel.
He remarried and his second wife was Mary ?. They had two boys, William and Frank.
He was a bricklayer by trade, but in 1932 he moved back to Saffron Walden to run the Sun pub in the high street. He died at age 79 and was living at 100. high street Saffron Walden at that time.

I am trying to find his parents and Mary's surname before she became a Bradford.
I don't think there are any surviving family lines, but it would be great if there were!