John GURNER can be found on the following English Census records:
1841 - St Marylebone, Middlesex, England, Class: HO107; Piece 676; Book: 3; Civil Parish: St Marylebone; County: Middlesex; Enumeration District: 5; Folio: 9; Page: 9; Line: 22; GSU roll: 438792.
http://search.ancestry.co.uk/cgi-bin/sse.dll?db=uki1841&indiv=try&h=7248607---------------------
Shipping record from "http://www.familyhistorysa.info/shipping/passengerlists.html" :
GURNER John, Sarah nee SKINNER, Sarah, Emily, Eliza, John, Fdk Wm, Geo, Louisa arrived 1849-12-19 on Minerva (5) from London v Plymouth