(22 Jun 2020, 10:42 am)Michael wrote Today's fleet update on the GNE site, suggest the B9 in for repaint is a "Red Arrow" one:
21 June 2020
Vehicle movements last week included the reinstatement of Volvo B7TL/East Lancs Myllennium Vyking 3971 (PJ02 PYX) at Washington, in a float/reserve capacity. Ahead of the delivery of the new double-deck buses for service X1, the existing allocation of “Red Arrows” branded Volvo B9TL/Wright Eclipse Gemini 2 vehicles are beginning to undergo repaint. 3971 (PJ02 PYX) will provide cover at Washington until the start of the school holidays while these repaints are ongoing.
So that basically confirms it's 6050.
I'm still puzzled as to what the green livery could be for.