Hi liz, hmmm I do get confused with the boundarys but I'm fairly certain it's Herts. Looking at the map it's within walking distance of Bengeo Street which is Hertford.
As for William ? thats the question, I'm not sure, he should be the William born c1788. But he's a proper mystery, born Thaxted, marriage to a Hannah Ackow in 1807. Daughter Mary Ann baptised 1807 Thaxted...then nothing.
He has nephews Robert b1825, James b1827 and William b1821 (it's not this one as he's found 1851/61 in London) Any Sturgeon's in the general area are all related somehow.
Suey