My mum has asked me to make a cake for her 80th birthday. I am a confident baker but there are several factors to take into account: we will be coming by train, we will have had a big restaurant lunch earlier in the day, and will probably be sharing it between at least 10 of us. I don't do pretty cakes with sugar work or perfect icing, it needs to taste great but not be too rich or heavy. I can assemble it at her house, so layers are a definite option, but I am feeling a bit stuck otherwise... Anyone have a brilliant idea??