01 - Preheat oven to 350°F. Grease and line a 2 lb loaf tin with baking parchment.
02 - In a large bowl, beat butter and caster sugar until pale and fluffy.
03 - Add eggs one at a time, blending thoroughly after each addition.
04 - Fold in flour, lemon zest, milk, and salt until just combined.
05 - Toss blueberries with a small amount of flour, then gently fold into the batter to prevent sinking.
06 - Transfer batter to prepared tin and smooth surface. Bake 50-55 minutes or until a skewer comes out clean.
07 - While baking, mix icing sugar with lemon juice to form the drizzle.
08 - Cool cake in tin for 10 minutes, prick surface with a skewer, then pour lemon drizzle evenly over cake. Allow to cool completely before slicing.