Stadler won a £610m contract in October 2016 to supply Greater Anglia with 58 Flirt UK sets in regional (class 755) and inter-city (class 745) variants. The order comprises 10 12-car EMUs for London - Norwich services; 10 12-car EMUs for Stansted Express airport services; 24 four-car bi-mode (diesel and electric) trains for regional services; and 14 three-car bi-mode trains for regional services.

The class 755s are due to enter passenger service on regional routes in Essex, Suffolk, Norfolk and Cambridgeshire in May 2019.
The order is part of a £1.4bn programme to renew the entire Greater Anglia train fleet, which also includes the delivery of 111 class 720 Aventra EMUs from Bombardier. The first of these trains was unveiled at Bombardier’s Derby plant in September.