(18 Dec 2017, 4:29 pm)Jimmi wrote Would imagine all depots have these displays, I've definitely seen Darlington Depot and Belmont Depot pop up, possibly Blyth Depot as well. Would imagine the usual Not In Service blind should be used but these probably get selected half the time instead, the Frequenta, Sapphire and MAX logo displays sometimes do as well.

The "South" has

Arriva Stockton 
Arriva Redcar     
Arriva Whitby 
These 3 display Arriva North East ******** Depot which is possibly the blind you saw. All depots have there own version of this as displayed at the end of Durham Rally 2016 with 1512 and 1324 displaying thier depots versions, Stockton and Durham respectively. 

The Max,  Sapphire and Frequenta logo is on a different number for the South, where as in the North its all on 0000 same as sorry not in service. Drivers use this cause its quicker.