Financial Times reported that the British government has entered exclusive talks with Boeing to replace the Royal Air Force’s E-3 Sentry.
By 대한민국 국군 Republic of Korea Armed Forces (https://www.flickr.com/photos/kormnd/22803851601/) [CC BY-SA 2.0 ], via Wikimedia Commons
The same report says Britain could be acquiring between five to six E-7s.