The British tradition is for a very dark fruitcake, with marzipan and icing, but we've always made this rather lighter version instead. You can make it the day before you want to eat it (rather than ages in advance) and it keeps for a couple of months wrapped in tin foil. We also never put nuts in, although similar recipes contain a handful of almonds or walnuts. The "mixed fruit" referred to in the ingredients is a mixture of raisins, sultanas, mixed peel, and maybe other things like currants. It's just something we buy ready mixed.