Couch Research Documents
I have listed here a number of basic source documents. Hope they are of interest.
England:
1851 census 1881 census Couch name origin The National Trust
New Zealand
UK to NZ conclusions NZ Couch's Telecom
Couch's from the NZ BD&M microfiche:
1848-1874 1875-1889 1890-1904 1905-1919 1920
Australia
Immigrant Couch's Couch's in Australia NSW Couch Marriages 1917-1937