The London Evening Standard has and interesting article on how prominent the iPad has become in a wide-range of London businesses. Unsurprisingly, the Evening Standard says that the device is very popular in the field of medicine -- specifically hospitals and doctors' offices. There doctors use the iPad not just for administrative access to medical records, but also to teleconference with patients over FaceTime and to help educate patients via visual aids such as anatomy or medical imaging apps.
As you might expect, the iPad is also popular in the restaurant and pub scene. Many eateries in the city now use iPads for menus,