16th September 2014 - Allocation & Movements
With thanks (as ever) to Richard Smiles, for supplying the information.

The entry into service of Streetlites 1550-59 at Stockton will allow for the withdrawal of 4001, 4007, 4030, 4037, 4038, 4039, 4040, 4043, 4046 and 4048.

On or near to this date, 7617/21 will return to service at Blyth, and this will allow 1712 to transfer to Darlington and 4068 to Redcar.
The transfer of 1712 to Darlington will allow 1656 to go for disposal, and the transfer of 4068 to Redcar will allow 4080 to go for disposal.

Also at Darlington, the return of 4809 will see 1612 going for disposal.

Redcar will additionally lose two spare vehicles, in the form of 1739 and 4092, both of which will go for disposal.
7491 will also transfer back to Ashington from Redcar/Whitby, as I assume the radiator modifications being carried out are now complete? This will allow 7483 to go for disposal at Ashington.