Preheat the oven to 170C
Prepare a baking tin by greasing it with butter or lining it with baking parchment
Put the butter, golden syrup and sugar in a saucepan and melt over a low heat
Mash the banana to a pulp and stir into the melted mixture
Add the oats, cinnamon, coconut, seeds, sultanas and nuts and mix thoroughly
Spoon the mixture into the baking tin, ensuring it is evenly spread
Bake for 25-30 minutes
Cut into portions in the baking tin
Leave to cool then turn out into a cooling rack