Heat oven to 160C/fan 140C/gas 3. Butter a 22cm square baking tin. Melt the butter, syrup and sugar in a pan. Pour in the oats, cinnamon, coconut, seeds and nuts, mix and pour into tin. Bake for 30-35 mins. Leave to cool for 5 mins, then cut into slices. Will keep for 1 week in an airtight container.