The class 25 is the perfect loco for NTP and I am quite surprised that it hasn't already been added. It would offer a great variety of services, freight and passenger. With this loco added I think it would really finish NTP off and make it a really immersive experience. The add-on could include the MK1 coach in BR Blue livery and also the BR General Utility Van (GUV) in full blue livery.
Bring it on and for Class 25 it's Blue Star MU system equipped meaning Class 45 can control Class 25 due to both being BLue Star MU equipped. With Heavy Freight Pack selected services get a Class 40 rear Class 25 front