Why UK is not Schengen countries?

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Tags

1. #borders
2. #still
3. #controls
4. #however
5. #policing
6. #entry
7. #criminal
8. #citizens
9. #schengen
10. #controlled
11. #parts
12. #anyone
13. #words
14. #regards
15. #rules
16. #system
17. #opted
18. #namely
19. #controversial
20. #other