Preheat your oven to 155 degrees Celsius. Line two baking sheets with baking paper. Place the oats, salt, almonds, cinnamon, and mixed spice in a large bowl. Pour over the oil and syrup. Toss thoroughly to ensure everything is well coated. Divide the mixture in half and spread out evenly on the two baking sheets. Pop in the oven for 40 minutes, stirring well after the first 20 minutes. Remove and allow granola to cool completely. Add the cranberries and sultanas. Store granola in an airtight container.
Serve with double cream plain yoghurt or vanilla yoghurt. If you want to add fresh fruit, banana or plump summer-ripe apricots work really well with the warming spice notes of this Christmas granola.