So I did some calculations of Arriva's proposed changes with some assumed running times. I got.....
- X21/35 - PVR 14x
- X22 - PVR 7x

Then...based on the following changes and some added time, I got a PVR of 17x. This would still leave 4x to play with for a new 42 and corresponding changes to the 43/44/45. Might actually end up not needing any of the 4x free but haven't worked anything out for the 42/43/44/45.

- X21 (every 30 mins) Same as proposal from Arriva interworking with 35. Now via Hartford Road rather than Nedderton.
* Changes to and from 35 at Cresswell Arms

- X22 (every 30 mins) Route unchanged.

- 35 (every 15 minutes) Same proposal from Arriva interworking with X21 (every 30 mins). Continues to Seacrest Rd and Woodhorn half-hourly as X21 with 15 minute frequency Morpeth > Newbiggin Cresswell Arms. Frequency increase would be a welcome improvement too!
* Changes to and from X21 at Cresswell Arms

Pattern
X22 ASH > NCL
X21 NCL > NBG CA
35 NBG CA > MOR
35 MOR > NBG CA
35 NBG CA > MOR
35 MOR > NBG CA
X21 NBG CA > NCL
X22 NCL > ASH