Place the flour and sugar into a large mixing bowl.
Cut the butter into small cubes, and add to the flour and sugar.
Rub the butter into the flour and sugar, using your fingertips and thumbs, until a clumpy crumble forms.
To make the filling, place the butter in a large pan, add the peaches and blueberries and cook just until the juices start to run, or if your peaches are not very ripe, sautee them first, to soften them up, and then stir through the berries. Remove from the heat and add the sugar, zest, juice and vanilla and scrape into a 9 inch (23cm) pie dish.
Scatter over the crumble and bake for 35-40 minutes, or until the fruit is bubbling and the crumble is golden and crisp.
Recipe by The Sugar Hit at http://www.thesugarhit.com/dev/2016/02/blueberry-peach-crumble.html