Thanks Mike, I have a list of all Harris' from Peterchurch copied down from the parish records, as my other Harris branch came from there, but I can't get to them at the moment as they're packed away from our recent move!

A quick look at the census throw up a couple of possible candidates for Henry living in Gloucestershire in 1841, but can't be sure where they were born.
A complete list of James & Judith's children:
William James 1836 (moved to London)
George Harris 1838 (my ancestor)
Thomas Harris 1840 (not found since 1851 census)
Eliza Harris 1843 (married Thomas Hahhry of Abergavenny & moved there)
Henry Harris 1845 (stayed in Bath)
Edwin 1847 (not found after 1861 census)
Frederick Alfred 1849 (moved briefly but returned to Bath)
Catherine 1851 (married Caleb Stacey & died in childbirth)
Christiana Jane 1853 (married Henry Fisher & moved to Bristol)