The 323s are a better bet for Northern because they have a very high seating capacity for a 3-car unit. Not necessarily wonderful if you don't like 3+2 seating, but a better bet operationally!
Yes, but if the situation gets worse with the CAF junk - and there is a good chance of that given the nature of the defect - then they won't be able to wait for the 323s. And as I posted above, they'll need to cover the 195s as well.
If you have to replace the CAF units medium term then 365s tick many of the boxes:
- available
- PRM compliant
- 100mph max speed
- "regional express" type interior
- good acceleration (certainly way better than a 319)
- same owner, so likely to be beneficial from a cost point of view
Not saying it will happen, but if the CAF sets are a longer term problem, then 365s represent an option worth exploring. It's a not dissimilar situation to the 385s in Scotland that saw the 365s used.