Heat the oven to 425F (220C) and grease a baking sheet with a little oil.
Sift both flours, baking soda, cinnamon and salt into a large mixing bowl, and add any remaining wholemeal from the sieve back into the bowl. Stir in the raisins and carrot and combine. Add the buttermilk and maple syrup and mix until it forms a dough.
Pat the dough into a round and place onto the greased baking sheet. Cut a cross across the top with a knife and sprinkle a little flour onto the top.
Bake for 25-35 minutes or until the top is golden and taping the bottom of the carrot soda bread makes a hollow sound. Allow to cool on a wire rack.
Notes
To make buttermilk, add 1 teaspoon of lemon juice or apple cider vinegar to the milk and let sit for 5 minutes, then stir.
For a vegan option, use non-dairy milk for the buttermilk.