Place the sugar, syrup and dairy-free spread into a large bowl and beat with an electric whisk until pale and fluffy in appearance. This will take about 2 minutes.Add all the other ingredients and carefully fold them into the mixture until the dry ingredients are combined with the wet.Whisk together for a further minute or so until nice and fluffy.Transfer the mixture to two well greased 15cm round tins, and smooth the tops.Bake in the centre of a pre-heated oven at 190 degrees (170 degree fan, gas mark 5) for 15 - 20 minutes until a skewer comes out clean and the top springs back when you touch it.Cool for 5 minutes before turning out on a wire rack to cool.While cooling, make the icing by mixing all the ingredients together until combined, then whisking for approx. 2 minutes until light and fluffy.Decorate how you like...checking the ingredients of everything you use!