Preheat oven to 350F (175C). Prepare a 9″ x 13″ pan.
Stir together flour, baking soda, porridge oats and brown sugar. Add melted butter and mix thoroughly.
Press 2/3 of the crumb mixture into prepared pan.
Stir cranberry sauce, dried cranberries, nuts and orange rind together and spread over bottom layer.
Bake for 30-35 minutes or until lightly browned.