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In page British Rail Class 379:

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The remaining 10 began entering service in summer 2011 on Cambridge services. The Class 379 first ran on 3 March 2011 between Liverpool Street and Stansted Airport. All units had entered service by mid-August 2011, two months ahead of schedule and the airport services are now entirely worked by 8-car Class 379s. The December 2011 timetable change included the introduction of 12-car trains on some peak workings out of Liverpool Street to/from Bishops Stortford, Harlow Town, Ely, Kings Lynn and Cambridge. Plus on some services out of Stratford to/from Cambridge, Harlow Town and Bishops Stortford and on some Bishops Stortford/Stansted Airport-Cambridge services. They work on long distance express services.[2]