Across
- 4. Overthrow (6)
- 8. Very small (4)
- 9. Captain Mainwaring's first name in Dad's Army (6)
- 11. Ashamed (9)
- 14. Former US president born in Honolulu, Hawaii in 1961 (6,5)
- 16. A little of this is a dangerous thing (9)
- 17. Unsinkable ship built in Belfast, Northern Ireland (7)
- 18. Against (6)
- 19. Celebration for 45 years' marriage (8)
- 20. Dung beetle (6)
Down
- 1. The bones of the spine (9)
- 2. Venomous snake native to Western Australia (6)
- 3. Discovered by John Cabot in 1497 (12)
- 5. Longest bone in the human body (5)
- 6. 500 sheets of paper (4)
- 7. Left-hand page of a book (5)
- 10. King Arthur's sword (9)
- 12. New Zealand lizard with three eyes (7)
- 13. Unit of currency in Hungary (6)
- 14. Break a promise (6)
- 15. He led the children of Israel out of Egypt (5)