Preheat the oven to 180 degrees C. Grease baking trays.
In a very large bowl, cream together the butter, brown sugar and white sugar until smooth. Beat in the eggs one at a time, then stir in the vanilla.
Combine the flour, salt and bicarb soda; stir into the sugar mixture until well incorporated. Mix in oats, then stir in the chocolate chips, nuts, coconut and raisins.
Drop by heaping teaspoonfuls onto the prepared baking trays. Bake for 10 to 12 minutes in the preheated oven, or until golden brown. Let biscuits cool for a few minutes on the baking trays before removing to wire racks to cool completely.
Make sure to soften the butter and get the eggs to room temperature before starting. For plumper raisins, boil in water for a few minutes and cool before adding to batter. If you want to play around with different flavours of chocolate chips, feel free.