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| Operator: | United Automobile | Fleet No: | BU644 |
| Chassis: | Bristol MW5G | Chassis No: | 184.188 |
| Body: | ECW B45F | Body No: | 12656 |
| 1961 | United Automobile Services Limited, Darlington (BU644) |
| May 62 | In service with United Automobile Services Limited, Darlington (BU644) |
| Apr 64 | Converted to B44F |
| Nov 64 | Fleet number changed to U644 |
| Jan 69 | Fleet number changed to 2644 |
| Converted to B44F | |
| <Mar 75 | Transferred to Central Works |
| Nov 75 | Out of service with United Automobile Services Limited, Darlington (2644) |