| Clue | Source | Date |
|---|---|---|
| - Castle, site in East Sussex of The Royal Greenwich Observatory from 1948-90 (12) | Mirror Quiz | 31 Aug 2025 |
| Home of Royal Greenwich Observatory, 1948-90 | The Times Specialist Sunday | 29 Oct 2023 |
| ____ Castle is a former home of the Royal Greenwich Observatory | The Times Specialist Sunday | 06 Feb 2022 |
| Redbrick castle of East Sussex | The Times Concise | 10 Mar 2019 |