looking for a marriage of the above couple.
1841 Census they are (BIC) and 1851 Census both born in Hunslet - (the same for their kids).
The information on a death for a Frederick Foster in Australia in 1903 has his parents as being John Foster & Fanny Greenwood* (*Fanny or Frances was the name of his wife's mother - Frances Hawkins/Dixon/Dickson - but it's the Greenwood name that might hold a clue......could it have been Sarah Greenwood?).
I cannot find any marriages in Hunslet for that time frame (eg 1810-1814?).
Not that this helps finding the marriage.........
The baptism at St Mary’s Hunslet gives Frederick Foster born 1819
death index record for Frederick Foster in Australia gives age 71 so a birth year c1833
Frederick Foster born 10 Nov 1819,
brother James bpt same day born 9 Sep 1817
Baptism 7 May 1820 St Mary the Virgin, Hunslet, Yorkshire
Parents John occ iron founder & Sarah
Fredk Foster Age: 71
Death Place: West Melbourne, Victoria
Father's Name: Foster Jno
Mother's Name: Fanny Greenwood
Registration Year: 1904
Registration Place: Victoria
Registration Number: 5994
Ellen Foster born 12 Mar 1869 Tasmania
Registration Year: 1869 Hobart, Tasmania, Australia
Father: Frederick Foster Mother: Mary Dixon
1841 census Piece: 1345 Folio: 28 Page Number: 13
John FOSTER 50 iron moulder
Sarah 50
Mary 25
James 20
FREDERICK 20 iron moulder
Rachel 15
Sarah 12
Martha 9
Elizabeth 7
Sarah 4