Stockton Depot allocation effective 1st December 2014
10/11: MAN ALX300
12/39: MAN E300
13: MAN ALX300
14/34: MAN ALX300
36/37/38: ADL E300 ('The Zone' first)
52/35: ADL E300
58/35: MAN ALX300
59/61: MAN ALX300
Sundays should basically see the branded E300s out on 36/37/38 with a mix of unbranded ADL E300s and the MAN E300s out on other work but in theory the ADL E300s have mainly been found on 10A/11A/52/58/59/61 with the MAN E300s turning up on 12/39. Naturally, it all depends what the running boards say as to what goes out on Sundays but the newer stock would be sent out over say a T-reg MAN.
As for allocations, particularly on Saturday, Saturdays see some buses starting later in the day (there's a bus that appears to start at Hartlepool at 11am on 36s) hence the seemingly random mix of vehicles everywhere on Saturday.
RE: Stagecoach North East: Rare & Odd Workings