Hi Ian, I think the Quarter Session records would be held in the Wiltshire Record Office and should provide more information than you already have. It would be interesting to see what he was charged with as minor transgressions were normally dealt with by Petty Sessions. Information could also be obtained from the calendar of prisoners on remand at the gaols etc.
1851 has him as a prisoner HO107/1846, f461, sched 194. Devizes Road, Wilts Gaol
Hezekiah Dear, PS, U, 18, lab, WIL Fisherton Anger
He was sentanced to at least 3 years in prison.
Cheers Dave