6376 is definitely the spare for Washington but it's on loan to Consett to assist with the repainting of blue Xlines StreetDeck 6304-07 which have recently transferred into the fleet from Chester-le-Street.
Dan posted this on Facebook about it why it’s at Consett for on one of the bus groups.
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New StreetDecks & ADL Enviro400s - X-lines fleet changes
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