Heat oven to 180c, 350F. Grease and line your baking tin. See here for how to line.
Start with making the cake batter by creaming the butter and sugar until a pale light colour. Place the blueberries in a bag and add a couple of tablespoons of flour. Give it a toss so the blueberries are coated. This will stop them from sinking to the bottom during baking.
Transfer the cake mixture to the greased and lined loaf tin. Place in the oven for 50 - 55 minutes, check after 50 minutes. Test if done by placing a skewer in the centre of the cake and make sure it comes out clean. Every oven is different so cook times will vary a little.
***** Please note, if using a Bundt tin, cook time is 45 minutes.