Hi BigJon,
1871 census.
57, West Street, Monks Coppenhall, Crewe, Cheshire.
All surnames WILLIAMSON.
Samuel, Head, Married, 33, Police Constable, b. Cheshire Hale
Elizabeth, Wife, Married, 39, Police Constable's wife, b. Cheshire Wybunbury
Alfred(?) James, Son, 8, Scholar, b. Cheshire Burland(?)
Thomas H., Son, 2, b. Cheshire Crewe.
Regards,
Lee.
p.s. As for serving in Wales: he certainly had plenty of time between censuses!