01 - Preheat the oven to 350°F. Grease and line a 2 lb loaf tin with baking parchment.
02 - In a large bowl, beat together the softened butter and caster sugar until pale and fluffy.
03 - Beat in the eggs one at a time, ensuring each is fully mixed before adding the next.
04 - Fold in the self-raising flour, lemon zest, milk, and a pinch of salt until just combined.
05 - Toss the blueberries lightly in flour, then gently fold them into the batter to prevent sinking.
06 - Transfer the batter to the prepared loaf tin and level the surface with a spatula.
07 - Bake for 50 to 55 minutes, or until a skewer inserted in the center comes out clean.
08 - While baking, mix the icing sugar and lemon juice until smooth to create the drizzle.
09 - Allow the cake to cool in the tin for 10 minutes, then prick the surface all over with a skewer.
10 - Pour the lemon drizzle evenly over the warm cake and let it cool completely before slicing.