Hi Susan.
My line is William Saffin who was sent out in 1826 from Somerset. Birth also says woolscombe but I was thinking Wiveliscombe. I have found quite a few saffins here.

link to a thread http://boards.ancestry.com.au/thread.aspx?o=30&m=1.13.1....

convict records www.foundersandsurvivors.org/pubsearch/convict/chain/ai61943
and church records Wiveliscombe. note a birth James Saffin 15 dec 1822

Maybe your James is my Williams nephew??