Preheat oven to 160 degrees. Grease and flour a large loaf pan and set aside.
In a large bowl, whisk the soft butter till creamy.
Add in the honey and whisk well, then stir in the egg. Add in the orange zest and combine.
In another bowl, whisk together the dry ingredients till well combined.
Into the honey mixture, alternate the flour mixture and orange and fold in with each addition,ending with the flour mixture.
Fold in the walnuts.
Pour into the prepared tin and bake for 60-75 minutes till skewer inserted in the centre comes out clean.
Allow to cool in pan for 10 minutes before flipping onto the rack and cooling completely.
Slice and serve with tea or coffee!