Greater Anglia unveiled a mock-up for its Class 720 Aventra fleet at Derby Litchurch Lane on September 11. The design is still to be finalised, which is due in November, with construction due to start before the end of the year. The first trains will begin testing next year, and the first trains enter traffic in 2019. They will be used on all GA routes from London Liverpool Street currently served by Class 317, '321', '360' and '379' other than Stansted Express routes, and will also run to Norwich once an hour.