Few things:

Any plans to replace Lites with Pulsars on Stockton 5/5A were seemingly dropped as the performance from Pulsar's supposedly weren't much better.

1534-6 are unlikely to go anywhere anytime soon considering we've just paid to refurbish them and get them into service from Yorkshire Tiger.

1514-16 ain't the best batch of Pulsar's you could choose to permanently allocate to the 685 as they have been pushed morning, noon and night 7 days a week since new on service 7 although 4660-62 are a bit unreliable for the 685 now supposedly.

There's older Volvo B7TLs in the fleet to be replaced before 7410-15 are.

As far as I'm aware, there is currently on new vehicles on order for Arriva North East, think we will only see cascades anytime soon myself.