(08 Feb 2018, 9:18 pm)NewcastleOne wrote My Guess would be
Ex London arriva buses
Scania Omnidekkas (GNE)
Some Solars (GNE)
Part of the Newer Stagecoach NE ALX300s

Not sure on the  Scania L94's, most are euro 5 anyway, Go North East are busy withdrawing the Euro 4 ones.

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(08 Feb 2018, 9:23 pm)Malarkey wrote Quite surprised up here it hasn't been split more evenly between the councils with Sunderland and County Durham councils benefiting also rather than those in close proximity of Newcastle, Which makes me think this is specifically aimed at making Newcastle City Centre a Greener Zone for Buses.

Most of the buses in Sunderland are Euro 5/6 anyway, only a hand full of older buses are euro 3/4 in Sunderland, 
the reserve darts at Stagecoach and the 3 buses on loan to Deptford (4937 and the 2 Vykings).