All the 52 plate MPDs were new to Washington, though some were used by Deptford when new and they often interchanged with Deptford while in the black 'Turn Up and Go' branding (I often travelled on them on the old Silksworth 133 service which had turquoise TUAG branding). In the mid 2000s 535-548 moved to other depots such as Winlaton and Deptford, some becoming Kingfishers. 532 went white at Washington while 533 and 534 kept their black Simply Washington branding for years until they started moving around to Stanley, then Winlaton, one visited Percy main at one point. I forget which specific vehicles went where. I know 543 was a Winlaton bus before moving to Deptford to become an extra Black Cat.
533 on the 44 to Stanley
https://www.flickr.com/.../chriswhitesbu...6203115645
534 on the 17 to Whitley Bay
https://www.flickr.com/.../chriswhitesbu...5917964963
Hopefully fingers crossed there might be few details in there that you've missed Dan
Furthermore given that I can't see the Details of the Previously Withdrawn MPD's, would it be worth creating another Fleetlist for all the Vehicles previously within the Fleet, including Demonstration Vehicles that Go North East have had over the Years, I think it would be quite handy for those tracking down Old Details of Former Vehicles, although I do understand this maybe a lot Harder and more Time Consuming than doing the Standard GNE Fleetlist.
Another Idea I had for the current Fleetlist, was to have for each Brand, have 1 or 2 Photos of Vehicle in an Old Livery, I'll list a few examples below, Although I am guessing you may prefer to use more up to date images of the Vehicles in the Fleet.
4950 - In Centrelink Livery while on Loan to CLS for Service 21
https://www.flickr.com/photos/chriswhite...812020972/
4951 - In it's first Go North East Livery
https://www.flickr.com/photos/jncarter1962/3095656039/
And have 4952/53 with a Photo of them on the X40