George's marriage you mention seems to have taken place in Aylesbury registration district Buckinghamshire.
Marriages Mar 1854
Clarke Sarah Aylesbury 3a 450
West George Aylesbury 3a 450
George would have been around 38. Was this a second marriage for him? Have you details from the marriage certificate?
Details would help place George on the 1851 census - where there are no George Wests born Stanmore showing (nearest was George aged 35 born Whitton, but he was a gardener).
The IGI has a baptism for a George West in Stanmore - father Samuel
GEORGE WEST
Christening: 31 MAY 1818 Great Stanmore, London
Father: SAMUEL WEST
Mother: SARAH
possible siblings
SOPHIA WEST
Christening: 17 JUL 1814 Great Stanmore, London
Father: SAMUEL WEST
Mother: SARAH
MARY ANN WEST
Christening: 17 SEP 1815 Great Stanmore, London
Father: SAMUEL WEST
Mother: SALLEY
SARAH WEST
Birth: 01 MAR 1817
Christening: 31 MAY 1818 Great Stanmore, London
Father: SAMUEL WEST
Mother: SARAH
By 1861 George would be in Australia (left England circa 1859)
The 1841 census does not give place of birth, merely whether born in or out of county, no relationships and rounds adult ages down to the nearest 5, so is harder to search.
It is possible that George' sister Sophia was living in Aylesbury on the 1851 census.
A Sophia Shepherd was born in Stanmore circa 1814 and appears on the 1851 census in Aylesbury. She had two children aged 8 and 5 and was married to Joseph (according to the children's baptisms - he was not with her on the 1851 census entry). The IGI does have a marriage for a Joseph Shepherd and Sophia West in London in 1842.
This might be the reason George married in Aylesbury.
This Sophia seems to have been in Aylesbury on the 1841 census with a potential younger sister.
HO107 62/4 folio 18 page 31
Temple Square Aylesbury Buckinghamshire
Sophia West 25 Dressmaker not born Buckinghamshire
Mary West 20 Dressmaker not born Buckinghamshire
Regards
Valda