Preheat the oven to 190°C/ fan 170°C/ Gas Mark 5. Grease and line a 2lb (900g) loaf tin with nonstick baking paper. Whisk the butter, honey and sugar together in a large bowl for 5 minutes. Gradually add the eggs a little at a time, adding a spoonful of flour if it starts to curdle. Now whiz the bananas with a dates in a food processor to a purée, add this to the bowl and whisk again. Mix the flours together with the bicarb and a pinch of salt, sift this over the whisked eggs and fold through along with the milk. Spoon into your prepared loaf tin and level the top. Pop into the oven to bake for 1 hour, or until a skewer inserted into the centre comes away clean, covering with foil if it starts to look a little brown. Leave to cool in the tin for 15 minutes before turning out.
