Add 100g of flour flour, all the yeast and the water into a bowl. Mix, cover with cling-film and leave in a warm place for 5 hours + to create the yeast flavour. After that, add the rest of the flour, salt, milk, malt extract and melted butter. Mix and kneed the mixture to make a firm dough (around 10 minutes) and leave for approx 1 and a half hours or until a point pushed in gentle springs back.