Like what Storx said. However, I don't think Redcar should lose some of their Pulsars they have had for ages like 1433. Stockton also may as well swap their Lites with Darlo and Ashington for some of their Pulsars to keep them from having microfleets everywhere. This is what I would do.

Northumbria to Stockton:
1404, 1462, 1463, 1480, 1493, 1495, 1496, 1497

Stockton to Northumbria:
1556, 1557, 1558, 1559, 1560, 1561, 1562, 1563

Darlington to Stockton:
1406, 1408, 1409, 1411, 1416, 1417, 1431, 1437

Stockton to Darlington:
1550, 1551, 1552, 1553, 1554, 1555, 1473, 1474

10 Brand New Evoras to Redcar
23x+ Pulsars from  North West to Redcar to Replace Temsas and Centro

Then theres the question with the Solos at Whitby and the DB300's

People would hate me for this but maybe

Redcar to Northumbria:
7609, 7610
Northumbria to Redcar:
7551, 7552

That'll sort the Park and Ride Contract for like 8 Years. Also with all the DB's up there, it gives them a case to buy an extra 2 new vehicles when all of them get withdrawn. No point of having the DB's in Redcar for them to Micro Manage them.

EDIT: Then I would have:

Stockton to Redcar:
1431,1432, 1437

Redcar to Stockton:
1418, 1420, 1421