| Reference Number | TPC/5/4/623 |
| Title | National Theatre Upper Theatre Lighting Bridge 4 (Proposed Extension of Lighting Bridge 4 Between the Two Central Hangers) |
| Level | Item |
| Date | April 1973 |
| Description | Denys Lasdun & Partners sketch number 552/SK16/4/73. |
| Extent | 1 drawing |
| Series | Denys Lasdun & Partners Drawings |