(25 Aug 2016, 10:51 pm)biglugs@yahoo.com wrote It was at newcastle at 12:15 so must of been 40 minutes late

It was definately the 1135 arrival into Middlesbrough as I saw it with my own two eyes - it was the working behind 1415 which had been the 1105 arrival (and the 2040 finish in Middlesbrough).

EDIT:
Just so people know which X12s are Stockton worked:
Board A
0614 ex-Stockton
0820 ex-Newcastle
1105 ex-Middlesbrough
1320 ex-Newcastle

Board B
0625 ex-Middlesbrough
0850 ex-Newcastle
1135 ex-Middlesbrough
1350 ex-Newcastle
1610 ex-Middlesbrough
1830 ex-Newcastle through to Middlesbrough (on previous timetable, was change bus in Durham)

Board C
0655 ex-Middlesbrough
0920 ex-Newcastle
1205 ex-Middlesbrough
1420 ex-Newcastle
1645 ex-Middlesbrough
1910 ex-Newcastle to Durham only

Board D
0725 ex-Middlesbrough
0950 ex-Newcastle
1235 ex-Middlesbrough
1450 ex-Newcastle
1715 ex-Middlesbrough to Chester-le-Street

Board J (the 'extra' turn)
1035 ex-Middlesbrough
1250 ex-Newcastle
1535 ex-Middlesbrough
1800 ex-Newcastle

Stockton also work the 0605 departure from Durham to Middlesbrough but that works onto 9/27/27a (as well as the last X66) and is now officially booked for 1415.