On Tuesday/Wednesday evening just gone I passed Jesmond's Pulsar 1496 (NK61CZL) on the A69 near Low Row with 'Engineering Bus on Test' displayed on the blinds with someone in orange overalls (guessing a fitter) stood at the front next to the driver.
I think going to Carlisle and back is a bit OTT for a bus going on a test run!!
RE: Arriva North East: Latest News & Discussion - July 2015