This is delicious, easy to make, a perfect Gluten Free recipe which will work just fine with regular plain flour.
125g butter
150g sugar
Zest of 2 lemons
2 eggs beaten with 30ml milk
300g gluten-free flour whisked with 2 tsp baking powder
4oz blueberry or natural Greek style yoghurt
6oz blueberries tossed in 1tsp Gluten Free flour
Oven at 180C

Beat butter and sugar together.
Beat the egg milk mixture and flour into the butter sugar mix by alternating a bit of each at a time until it is all fully incorporated.
Stir in the yoghurt and blueberries.
Tip into a greased loaf tin and bake for 40 mins at 180C until golden brown and cooked through.