Preheat the oven to 180 C / Gas 4. Grease a 900g loaf tin and line with baking parchment.
In a bowl, beat together the butter and sugar until pale and creamy. Add the eggs, one at a time beating well after each addition. Mix in the remainder of the ingredients until well blended. Spoon into the prepared loaf tin and smooth the top.
Bake in the preheated oven for 90 minutes or until a skewer inserted into the centre comes out clean. Remove from the oven and allow to cool in the tin before transferring to a serving plate and slicing.