A not so "united" kingdom?

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Across
  1. 5. Fein Irish political party which wants Ireland to be reunited
  2. 6. City of Holyrood Palace
  3. 8. Member of Parliament for short
  4. 9. Having a hard time doing something
  5. 14. Man who wants to build a bridge between Scotland and Northern Ireland
  6. 16. Cymru Welsh Nationalist Party
  7. 18. Another adjective to say it is perfect
  8. 19. Kingdom Great Britain + Northern Ireland
  9. 20. Oldest radio and source of information in the UK
  10. 21. An iconic figure of the Royal Family with a tragic destiny
  11. 22. Political movement which often supports independence
  12. 23. A person who will inherits or has the right to inherit something
  13. 25. Act done to get the United Kingdom out of the European Union
  14. 27. Communication
  15. 28. Native language of Wales
  16. 29. Assembly of people in the street here to protest for something
  17. 31. Last Name of the DUP leader in 2019
Down
  1. 1. Son of Elizabeth II
  2. 2. Palace of the Royal Family
  3. 3. Charles Prince of Wales from July 1969 to his mother’s death
  4. 4. Last Queen of the United Kingdom
  5. 7. When power is decentralized
  6. 10. Action of unifying again
  7. 11. City of the Houses of Parliament of the United Kingdom
  8. 12. A ceremony that a person undergoes to mark their new position (often of power)
  9. 13. Group of countries under the authority of one leader
  10. 15. Country which is part of the United Kingdom and has a huge accent
  11. 17. Someone actively fighting for an idea
  12. 24. Animal on the Welsh flag
  13. 25. First Name of an English Prime Minister in 2019
  14. 26. Feeling of belonging to a certain group
  15. 30. Continent featuring countries such as Lichtenstein, and Cyprus