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Whisk together the self-raising flour and baking soda.
Cream together the butter and the sugar.
Beat the eggs in, one at a time.
Mix in half of the flour and half of the mashed banana.
Mix in the remaining flour and banana.
Add the chunks of dark chocolate and walnut halves, reserving a handful to decorate when baked.
Mix in evenly.
Scoop the batter into a greased loaf tin.
Bake at 180'C for 35 minutes until a skewer comes out clean.
Leave to cool a little before turning out of the tin.
Mix together the icing sugar and water to make a runny icing.
Drizzle over the banana bread and top with the remaining walnut halves.