Preheat oven to 180 degrees C. Grease baking trays.
In a large bowl, cream together the butter, brown sugar and white sugar until light and fluffy. Add the eggs one at a time, beating well with each addition, then stir in the vanilla. Combine the flour, bicarb soda, baking powder, and salt; gradually stir into the creamed mixture. Finally, stir in the oats, wheat germ, raisins and walnuts.
Drop biscuits by heaping tablespoonfuls onto the prepared baking trays. Wet hands and flatten biscuits slightly. Biscuits should be about 2cm thick and 5cm wide before baking.
Bake for 15 to 20 minutes in the preheated oven. Allow biscuits to cool on baking tray for 5 minutes before removing to a wire rack to cool completely.