Well i'm at home now and i've just done an experiment. I've held down the string on the 3rd fret of the e-string and gently applied pressure to the back of the neck towards the nut and the fret buzz when plucked seems to disappear.
So if i'm sat in the sat with it on my lap as though i'm going to play then if i applied pressue so i'm bending the neck away from my body then that seems to stop it. Which way would i need to turn it for that? Clockwise or anti clockwise?
Edit: I believe i need to up-bow it slightly. So is that clockwise or anti-clockwise? How much do i have to loosen the strings by before adjusting it? Is it alot or not very much?
Edit 2: Thank you DiabolusInMusic. This guide is very usful http://www.jerzydrozdbasses.com/akcn...ide_ver100.pdf