Here is the low down on ball positions:

WOODS  ( Driver and Fairway)

Feet shoulder width apart  Ball set opposite  left heel

HYBRID

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.

Good Golfing,

Mark.