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Nope.
379s do all stansted runs.
Of the former Stansted Express 317s, the 317/7s are stored and the 317/8s are now part of the common 317 fleet along with the 317/5s & 317/6s.
Adam
There have been no Cl317 StanEx diagrams for ages. However, they do occasionally substitute in the event of a sick Cl379 that cannot be covered by another unit of the same type, as happened a couple of days ago.