• Preheat oven to 350°F/175°C, butter and flour (2) 9×5 inch loaf pans. Sift together the flour, baking powder, and sea salt. Set aside.
• Beat the butter and sugar together until creamed, then add the eggs one at a time blending well after each addition. Then add the vanilla extract. Add the sifted flour mixture into the creamed butter and sugar mixture, in two batches. Make sure that you don't overmix the batter. 
• Add the lemon zest and juice, mix in gently by hand. Then gently mix in the mashed bananas. Dust the blueberries with the Tablespoon of flour (so they don't sink to the bottom of the bread) and fold into the batter gently.
• Immediately pour the batter into prepared pan and bake for 55-65 minutes, or until a toothpick inserted in the center of the loaf comes out clean. Remove from the oven, place the loaf pans onto a wire rack and allow them to cool completely. 

Icing

• Prepare the Lush Vanilla Glaze by whisking together the confectioners’ sugar with the milk and vanilla extract (or paste). Start by adding 2 Tablesppons of milk and if you want a thinner glaze then add more milk until the desired consistency is reached.