There's a bit of semantic confusion, I think. In the UK, "lemonade" usually means lemon-flavored carbonated soda, as opposed to here in the States, where it tends to mean diluted and sweetened lemon juice. So the Sprite thing probably isn't that far off if you're going for "authenticity" or whatever.
That said, beer and U.S.-style lemonade can be refreshing. Sprite is disgusting.