Cream margarine until soft and add sugar and beat until light and fluffy. Add the eggs one at a time, beting well between each addition. Mix in marmalade, sultanas and flour.

Turn into greased and bottom-lined deep 7 inch cake tin. Level the surface, and bake at 350 for 1 - 1 1/2 hours or until a skewer comes out clean. Cool for 15 minutes and turn out onto rack to cool completely.