Tip the granola onto a large baking tray lined with a baking sheet. Spread a little as you would do with the top of a crumble. You do not want it too thin.
Bake for 20 mins. Mix & spread the granola a little bit more. Bake for another 10 mins. Mix and spread again. Switch off the oven and leave granola to "dry" inside for 2 hours or so
Mix the sultanas, almonds and flax seeds with granola. Store in an airtight container.