Preheat the oven to 180°c
Soak the raisins in boiling water for 10 minutes while you make the cake batter
Get 2 large mixing bowls
Bowl 1- Cream the Margarine and Sugar, add the egg, whisk until combined
Bowl 2- Sieve the flour, Baking Soda, Bicarbonate of Soda and salt, mix together with a wooden spoon
A little at a time pour Bowl 2 into bowl 1 mixing continuously with a wooden spoon
Next pour the milk into the batter a little at a time, stirring as you go. Mix until combined-don't over mix
Drain the Raisins and fold into the cake batter, set aside
Get a small bowl and mix together the Powdered Cinnamon and Brown Sugar
Line a 2lb loaf tin with baking paper or a baking liner.
Spoon half the cake batter into the loaf tin, top with half the Cinnamon Sugar
Spoon the rest of the cake batter on top, sprinkle with the remaining Cinnamon sugar
Bake at the bottom of the oven for 45-50 minutes, until a skewer comes out clean
Turn out onto a cooling rack
Make the Icing by combining the Icing sugar with the water, mix until you have a gloopy consistency
Drizzle on top of the cake once it has completely cooled.