Best-Ever Lemon Drizzle Cake

Name: Best Ever Lemon Drizzle
Ingredients: 225g unsalted butter, softened; 225g caster sugar; 4 eggs; 225g self-raising flour; Zest of 2 lemons; 1 tsp lemon extract/oil; For the drizzle topping:; Juice of 2 lemons; 150g icing sugar; 75g caster sugar