Here is the low down on ball positions:
WOODS ( Driver and Fairway)
Feet shoulder width apart Ball set opposite left heel
Feet Shoulder width apart Ball set back to right 1 ball width
IRONS (2 to 7)
Feet Shoulder width apart Ball set back to right 2 ball width
IRONS (8,9,P/W S/W)
Ball same position as all other irons but stance just getting slightly narrower for each club.