For the base: Preheat the oven to 150C/130C Fan and grease and line a 23cm square baking tin, then set aside. Crush the digestives into small pieces and chop the pecans roughly and then add them both to a large bowl. Then add the sugar and rolled oats and set aside until needed.
In a large pan, stir the butter, golden syrup, maple syrup and vanilla over a low heat until blended together. Then take off the heat and pour into the dry mixture, mixing well. Pour the mixture into the prepared baking tin and bake for 30 minutes or until the surface is lightly browned. Then place onto a wire rack to cool completely.
For the topping: Melt the chocolate over a bain-marie ensuring that the base of the bow doesn't touch the water. Then pour onto the cooled base and spread evenly with a palette knife.
Leave to set for 2 hours and then cut into 12 rectangles.