| VIRGO | A constellation shown by the Royal Greenwich Observatory after six (5) |
| LIBRA | Constellation shown by liberal artist (5) |
| SOUTHERNCROSS | Constellation shown on the Australian national flag (8,5) |
| PISCES | Zodiac constellation shown as fish tied together (6) |
| HERSTMONCEUX | Castle which was the headquarters of the Royal Greenwich Observatory from 1948 to 1990 (12) |
| WREN | Main architect of the Royal Greenwich Observatory (4) |
| ASDIC | Created towards the end of First World War and further developed by the Royal Navy, a British version of Sonar (5) |
| ORION | Maritime surveillance aircraft used by the Royal NZ Air Force since the 1960s (5) |
| HOOKE | Discoverer of the law of elasticity whose folio volume Micrographia illustrated with copperplate engravings was an early book published by the Royal Society (5) |
| WRENS | Small birds formerly used by the Royal Navy (5) |
| TWEED | River crossed by the Royal Border Bridge (5) |
| SALON | Exhibition held to showcase works of living artists such as that originally organised by the Royal Academy of Painting and Sculpture in Paris (5) |
| TOMPION | Master horologist whose works include two clocks for the Greenwich Observatory for Charles II, a clock in Bath's Pump Room and sundials for Kew and Hampton Court gardens (7) |
| TORPEDO | A weapon used by the Royal Navy is distributed from this depot on the banks of the River Yeo (7) |
| SCIENCE | From the Latin meaning "knowledge", a body of learning promoted by the Royal Society (7) |
| SPITFIRES | Fighters flown by the Royal Canadian Air Force during the Normandy Landings, keeping the skies clear of enemy planes |
| NEWTON | Scientist whose magnum opus Principia was published by the Royal Society with the help of Edmond Halley in 1687 and remains one of the world's most influential works |
| FRIGATE | Warship; as defined by the Royal Navy in World War II, one larger than a corvette and smaller than a destroyer, used as an antisubmarine escort vessel (7) |
| SILENCE | Short play by Harold Pinter premiered by the Royal Shakespeare Company in 1969, directed by Peter Hall |
| FITNESSROUTINE | Created by the Royal Canadian Air Force, the 'XBX' is a 12-minute what?: 2 wds. |
