How are UK postcodes determined?

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Tags

1. #royal
2. #postcodes
3. #outward
4. #different
5. #defines
6. #numbers
7. #levels
8. #postcode
9. #geographic
10. #inward
11. #combination
12. #parts
13. #called
14. #explained
15. #letters
16. #which
17. #consists