I have this cheap Chinese guitar I got off ebay when I turn down the volume on the guitar it has this earth buzz and i was wondering if that is more likely to be the Knobs themselves or the pickups

It could be anything really... Is the bridge grounded? Does it have sheilding in the elecronics cavity?

Member of the Morley PWB Owners Club.
I don't really know to be honest, I didn't even know that there should be shielding or that the bridge should be earthed, but thanks I shall have a look into that.