Preheat the oven to 180 degrees Centigrade and line a loaf tin
Melt together the margarine, sugar, syrup and mixed spice
Pour in the oats, fruits, seeds and zest (if using). Mix until all is well coated with the syrup mixture.
Pres into the lined loaf tin and bake for 20 minutes until golden around the edges
Leave to fully cool before cutting into 6 even slices and then dust liberally with icing sugar
These keep well for up to a week in a sealed container or wrap individually and freeze. Just pop a frozen bar into your lunchbox and it’ll be perfectly ready to eat by mid morning!