Here in Oz raisins and sultanas are different. Raisins are big and dark (the way I like my men, oh no, sorry - forgot I was married there for a minute *BG*) and are probably made from dark grapes and sultanas are smaller and lighter in taste and colour, probably made from green grapes. They make a difference to the taste of what you are making. Dark, rich, fruit cake, and rum goes with raisins but sultanas suit light fruit cake or light/delicate fruity things.
I'll add some recipes when I have typed them in. Helen