| Ref No | DS.SWH/4/6/1 |
| Title | Technical office files: contracts |
| Description | Some overlap with later contract files DS.SWH/4/5/3-4, but forming a distinct series, with generally more technical content |
| AccessStatus | Open |
| AccessConditions | This series has not been listed to individual item level (unless there was only one file for a given contract), however all records can be produced on request. |
| Related Material | Plans from this series have been listed separately at DS.SWH/4/PL |