Hi Tom,
Without wishing to muddy the waters;
There is a separate "Cobb" family marrying and rasing children with parents George & Elizabeth Cobb in the parish of Drayton St.Leonard, Oxon. I note there is a Harriet Eliza Cobb bapt. 16-8-1857 (d/o George & Eliza)
This George Cobb (23, bach, carter, s/o William) - m - Elizabeth Russell (20, sp, servant, d/o Thomas) 11-10-1856 Drayton, by Banns
Alan