Pre-heat oven at 160°C (320°F). Line a loaf tin with baking paper (I used a relatively wide tin).Place all dry ingredients in a large bowl and mix to combine.Place all wet ingredients in a blender, reserving about a ¼ cup of dates (chop and fold through the mixture at the end for added texture). Blend till smooth.Pour the wet mixture over the dry and fold together till combined. Quickly pour the batter into the loaf tin and place a sliced banana over the top.Place in the oven on a rack in the middle, and bake (forced fan) for 1 hour 15 minutes or until a skewer comes out clean.Once cool, remove from tin and let cool completely on a wire rack before serving.