Preheat the oven to 180 degrees C. Grease baking trays.
In a large bowl cream together the butter and brown sugar until smooth. Beat in the egg then stir in the milk and vanilla. Mix in the flour, oats, bicarbonate of soda and cinnamon until well blended. Fold in the walnuts and sultanas. Drop by rounded spoonfuls onto the prepared baking tray.
Bake for 8 to 10 minutes in the preheated oven. Allow biscuits to cool on baking tray for 5 minutes before removing to a wire rack to cool completely.
Unfortunately this recipe didn't work. There was a lot of mixture and I cooked one batch first. The cookies were very loose and a bit greasy. I added extra flour to the mixture I had left and they were much better. I would reccomend adding at least 70-100g more flour. Eventually they were quite nice. - 27 Feb 2013