Hi all,
Just thought I'd let you know that I think I have this puzzle solved - mostly thanks to you BumbleB! As you suggested I downloaded Parloc, and then instead of searching by surname, I searched for George's born between 1800-1810 in all the parishes within 10 miles of Darton (that's 60 of them!). At Wentworth a George Habbishon was born 1802 (don't ask how that doesn't come up as a soundex of Habbershon!) and he had a brother Joseph Habbeshon born in 1800. Sorted!
Thanks for all your help - now I just need to find access to the Wentworth burial records!