It looks like 1429&1430 have gone on a short term loan to Arriva Yorkshire
https://www.flickr.com/photos/99337323@N07/50071910948/
According to the photo description these are replacing 1058&1059 at the Arriva Yorkshire fleet temporally while 1058/59 are away for exhaust mods.

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(03 Jul 2020, 5:43 pm)Dan wrote Russ Petty has noted on the Arriva North East and Yorkshire Enthusiasts Facebook group that 1429 & 1430 have transferred to Arriva Yorkshire's Heckmondwike Depot on temporary loan.

Photo attached.

Beat us by a minute