Just to let you all know, this isn't an abandoned project...

Indeed, I've just fired off an e-mail this evening with my queries for the last few vehicles I'm yet to complete (of the ones that I am completing - ie everything but the 484x/485x Volvo B10BLEs and the remaining Olympians in the fleet).
I was so busy with other things last month that I completely forgot to send off that e-mail, but as I was updating things on the fleet lists today, I remembered to send it.
When I get a reply and have a chance to update those vehicles, I'll move on to providing a photo for each event in the Fleet History section for every vehicle in the fleet! This is the style I have adopted - only the date is hyperlinked, making it more presentable. If I cannot find any photographs for that event, it is left blank.

I've updated the photographs for all of the minibuses in the fleet too - some have been updated with better quality photographs while others have been updated with more recent photographs showing that vehicle at its current depot/in its current livery. I have deleted the photographs for those records which have not got an up-to-date photo showing what the bus looks like at the moment (542/45/46/64/66/69, 603/05/51).

With regards to some of the previous records I was updating:
Go North East's paper records for movements prior to 2003 are held at Chester-le-Street, meaning that I'm unable to confirm when 3890/91 transferred from Chester-le-Street Depot to Percy Main.
Other things I had question marks above, including some of the Scania L94s and Volvo B7TLs, have all now been updated to reflect the missing dates.