Hum from my Rega Planar 3

noroance, do you know if they have this procedure on u-tube?

This will help (yes, I own one) if you don't want to modify your turntable. @noromance  is correct though; his is the best solution.

Humbucker

Regas are notorious for hum issues. Search for "rega+hum" brings up the only real solution—solder a wire from the motor body to the arm gound.