On the British register which holds all births deaths and marriages, there is NO George Horn registered during 1846 in Norfolk. You have obviously not got the correct date of birth. When he married, he put his name as Hurn.
Have you got his mariage certificate. This would give his father's name and occupation.
Marriages Dec 1865
Gotts Mary Erpingham 4b 177
Hurn George Erpingham 4b 177