Preheat oven to 350°F.
In a large bowl, beat butter, sugars, vanilla and eggs with mixer on medium speed or with spoon until light and fluffy.
In a separate bowl, combine flour, baking soda, baking powder and salt.
Combine dry ingredients to wet ingredients and combine completely.
Mix in chocolate chips and Heath bits.
Measure dough using a medium cookie scoop (about 1.5 tablespoons) or roll into a ball.
On cookie sheet lined with parchment paper or a silicone baking mat, place dough balls 2 inches apart.
Bake in your oven or cooker (as they liked to call it when I lived in England) 11 to 13 minutes or until light brown (centers will be soft).
Cool 10 minutes on pan, and then remove from cookie sheet to cooling rack.