Whisk flour, baking powder, salt, set aside

In bowl combine sugar and lemon zest, rub with fingers until completely mixed

In bowl beat butter and sugar until light and fluffy. Add eggs, vanilla essence, lemon juice and milk. Beat until slightly mixed

Add flour mixture and mix on low speed until just combined.

Add 1 tbsp flour to bowl with blueberries and toss. This helps berries not to sink in the bottom