Preheat oven to 180°C. Melt syrup, spread and sugar in a saucepan. Add crumbled cereal biscuits and flour. Combine. Add remaining ingredients, except water. Stir till combined then add hot water and mix well. If needed, add extra hot water.
Using wet hands, press mixture into a greased sponge-roll tin and bake for 30 minutes.
To make icing, mix lemon juice into icing sugar. Add a few drops of water if necessary and drizzle icing over top of golden biscuit base. Slice into bars.