Gas Bus 28010 has been on the E1/E2/E6 today.
28004 and 28026 have also been on the E1/E2/E6 today according to the Bus Times website and map.
I think this is the first time Gas Buses have been used on the E's on a Sunday?
RE: Stagecoach North East: Rare & Odd Workings - October 2019