Is this your John LONG, or the next generation?
"Died, at Hilperton, a few days since, Mrs. Long, relict of Mr. John Long, formerly of that place."
Monday, Apr. 19, 1830
Publication: Salisbury and Winchester Journal
Modified to add:
There are also a number of mentions of John LONG of Hilperton issued Gamekeepers Certificates - 1801, 1803, 1807, 1808.