The eldest known child's birth was registered in Brampton registration district (covers Farlam).
Births Jun 1855 Carruthers Jane Brampton 10b 336
From the IGI all baptised Farlam
JANE CARRUTHERS Christening: 22 JUL 1855 ISABELLA CARRUTHERS Christening: 19 JUL 1857 GEORGE CARRUTHERS Christening: 08 MAY 1859 BETSY CARRUTHERS Christening: 25 MAY 1862 ROBERT TOMLINSON CARRUTHERS Christening: 26 FEB 1865
Which if a marriage did occur before the birth of the first child places it after the 1851 census (census night 30th March) and the baptism of Jane on 22nd July 1855.