There has been a “fundamental” shift in how advertisers think about the role of ad agencies, as Mark Read, WPP’s new chief executive, puts it. Now they are pushing a more experience-led, always-on strategy, rather than 30-second ads. It is focused on the end-to-end, digital customer experience from search and discovery to purchase, delivery and continued customer loyalty. All these “touchpoints” need to be joined up with technology and data but most traditional ad agencies don’t have the capabilities.