Grease and line a 25cm cake tin and put aside. Beat together the margarine, caster sugar and vanilla essence till light and fluffy, then beat in the eggs one at a time. Next, fold in ……of the natural yogurt, then sift in the flour and bicarbonate of soda and mix together well. Pour the cake mixture into the prepared cake tin and even out. Place the apricots halves decoratively on top and sprinkle over the white chocolate chips. Bake in the oven at 180`c for approximately 45 minutes, or cooked through. Remove from the oven leave to cool down. Meanwhile, mix the icing sugar with a little warm water to make some glace` icing and drizzle over the cake. Allow to cool down completely before removing from the cake tin and serving.