25h

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Across
  1. 4. - WWII bombing of British cities five
  2. 5. - Spanish fleet defeated in 1588 eight
  3. 8. - UK's exit from the European Union six
  4. 9. - Guardian of the Tower of London twelve
  5. 10. - WWII British Prime Minister eleven
  6. 12. - Era named after Queen Elizabeth I eleven
  7. 14. - Ancient Celtic priests five
  8. 15. - 1066 invaders of England seven
  9. 16. - Epic journey of a Greek hero (7 letters, seven)
Down
  1. 1. - Leader of the English Civil War seven
  2. 2. - Current ruling royal house seven
  3. 3. - Prehistoric monument in Wiltshire ten
  4. 6. - Document limiting the king's power in 1215 twelve
  5. 7. - Longest-reigning monarch before Elizabeth II eight
  6. 11. - Roman wall builder in Britain seven
  7. 13. - Monarch dynasty known for Henry VIII six