With thanks to contacts, the Frequenta vehicles will be as followed:
3/3a/3b: 2830/2/3/5/6/41
4: 2859-61, 2862
9/10: 2863-9
13a/b: 2852-8
2: 4801-8
Generic: 2843/9/50
Unconfirmed: 2851 (reckon it will be generic)
RE: Arriva North East: Latest News & Discussion - July 2015