Martha's lemon & blueberry bundt cake

Name: Martha's lemon & blueberry bundt cake
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Cuisine: European, British
Ingredients: 225 g butter, softened; 225 g caster sugar; 4 British Blacktail Large Free Range Eggs, at room temperature; 225 g plain flour; 1½ tsp baking powder; 125 g blueberries; 2 Finely grated zest of lemons