I am currently trying to improve my baking skills (nothing to do with GB bake off of course!) and I have been concentrating on a simple sponge cake. I have read loads of helpful tips for the cake on mn and my sponge is slowly improving, but I wondered if anyone has tips on how to get a nice, smooth glacé icing? Mine tends to be too runny or lumpy and I can never seem to get a good spreadable consistency. Any ideas please??