Hi Bry
Just putting that surname into the 1841 census and IGI...come up with nothing ...The closest I can find is a Geroge (sic) Bickle b Art Hill , Cornwall , on vessels Scotland in 1861... never heard of a place called Art Hill LOL
I am sure that Ann's surname has been mistranscribed quite often...see below ... I am sure that it must be Barkla as this seems like a far more common name in Cornwall. Also the Cornish accent may play a large roll in it being mispelled
(I had an Amelia Carnarton ,b Cornwall, who name was spelled Knoriton on her marriage cert LOL )
Hi Bry
I have been looking for a while for the Barkla Family in 1841 ....at last I have found them; they were transcribed under "BARKELL" and enumerator wrote them down as BARKELE 
1841
St Agnes
JONAS Barkele (sic) 40 tin miner
Honnor " 40
John " 15 Tin Miner
Thomas " 15 tin miner
James " 14 tin miner
William " 13 tin miner
Isaac " 11 tin miner
ANN " 8 ........................she married Nicholas Stephens
Mary " 6
Henery " 4
Samuel " 2
all born in county
IGI has this extracted marriage:
Jonas BARKLA to Honor TONKIN
5 july 1823
St Agnes near Truro
deb 
Maybe the way to go is to find a birth record of one of Ann Stephen nee Barkla's siblings where it would show Jonas' surname .
What do you think ?
deb
