Method: 1. Preheat oven to 180°C/350°F/Gas 4. Lightly grease and base line a 900g/2lb loaf tin. 2. Put the butter and sugar into a large mixing bowl and cream together until well combined. 3. Mash the bananas and beat with the yogurt and eggs. 4. Add the banana mixture to the creamed mixture and mix well. 5. Finally, stir in the flours, bread soda and the wheat germ, mix well. 6. Transfer to the prepared tin and smooth the top with the back of a spoon. Make the topping, if used, by mixing all the ingredients together and sprinkle over the top. 7. Bake in the centre of the oven for about 50 to 60 minutes until risen and skewer or knife pressed into the centre comes out clean. 8. Remove from oven and leave to set۪ in tin for about 10 minutes, then transfer to a wire tray to cool.