I've decided I'm not going searching anywhere around Kemble until I know what JSFT means.
And the 4 times thing could be anything... 4 metres, miles, train stops, locks... it's just a bit... vague (sorry to use that word about the clues!)
Good luck to anyone that decides to go hunting. Hope you find it. But if I figure out the JSFT thing, I wanna beat you to it!