Thank you so much for responding to my request.
We have some "stray" Killicks in the Channel Islands, beginning with a Samuel who married Louisa Masters on 29 Oct 1839 in St Helier. She was born 1819 in St Peter Port, Guernsey. They had children, but by the 1851 census Louisa had remarried and I assume Samuel was dead.
The problem is really with the origins of Samuel Killick. One researcher has a note that he was born in Hove, Sussex, but cannot remember where he got the information. I can find no sign of S. in that county, nor anywhere really! And why did he go to Jersey in the first place?
Anyway, I'll plod on. Thanks again. Madeline nee Killick, England