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| Operator: | United Automobile | Fleet No: | BU646 |
| Chassis: | Bristol MW5G | Chassis No: | 184.190 |
| Body: | ECW B45F | Body No: | 12658 |
| 1961 | United Automobile Services Limited, Darlington (BU646) |
| May 62 | In service with United Automobile Services Limited, Darlington (BU646) |
| Nov 64 | Fleet number changed to U646 |
| Jan 69 | Fleet number changed to 2646 |
| <Mar 75 | Transferred to Alnwick |
| Feb 77 | Out of service with United Automobile Services Limited, Darlington (2646) |