The class 150 was frequent on the tees Valley line and also trans pennine services. It would be fab if it was added to Tees Valley and Leeds to Manchester Victoria routes.
The Tees Valley would be realistic but perhaps with the older Provincial livery. As for Transpennine, this is set around 1984 which is around 2 years before the mass rollout of Sprinters.
Yeah NTP is too old for Sprinters, Tees Valley is the right period but was always dominated by Pacers, I'm not sure how common the 150s would have been in that area, I suspect not very.
I understand 150s are banned from the Durham Coast as the gap between the mid mounted doors and the platform at some stations is excessive. I believe the same goes for 195s. That's probably why they were less common around Middlesborough to prevent them ending up on the Coast