Brexit troubles

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Across
  1. 3. money you receive from the government when you have retired
  2. 4. a long, narrow ditch dug by troops to provide a place of shelter from enemy fire.
  3. 7. to put something or someone into a situation where there is danger of loss
  4. 8. to cause a procedure to be carried out
  5. 9. to move
  6. 10. to have the opposite, undesirable effect
  7. 13. the act or fact of forming a united whole
  8. 15. ridiculously small or few
  9. 16. involving two parties, particularly countries
  10. 17. never done or known before
  11. 19. sign or give formal consent to (a treaty, contract, or agreement), making it officially valid
  12. 20. to power to influence a person or situation
  13. 22. probably
  14. 23. having little or no practical relevance
Down
  1. 1. a piece of work to be done or undertaken
  2. 2. developed to a high degree of complexity
  3. 5. the condition of being equal or equivalent in value, worth, function
  4. 6. not long ago
  5. 9. a reversal or check in progress
  6. 11. to carry out as required or requested
  7. 12. A sum of money granted to help an industry keep prices low
  8. 14. if you are at this, you are in a serious dispute with someone
  9. 18. not international
  10. 21. prevent or hinder the progress of something