| Clue | Source | Date |
|---|---|---|
| Household air-raid protection during WWII (8,7) | ||
| SOS Netherlander broadcast from a WWII protective structure (8,7) | ||
| Protective structure for cultivating Netherlands rose (8,7) | ||
| World War II hut, designed in 1938, named after the then Lord Privy Seal | The Telegraph General Knowledge | 11 Nov 2019 |