Happy iPad-launch eve! What you need to know before lining up

On Friday, stores around the world will be opening their doors to crowds of Apple fans, eager to be the first to swipe their frozen, grimy fingers across the glorious new iPad Retina display. The lines aren’t necessary, you can buy the devices online, but they’re an admirable feat of branding and marketing, and a display of just how hungry Apple fans are to have the latest gadget before anyone else.