Why do postcodes change?

Related questions

1. What do the letters in a postcode mean?
2. Is your postcode unique to your house?
3. Is zip code and PIN code same?
4. How does the UK postcode system work?
5. Are postal codes house specific?
6. Can two houses have the same postal code?
7. How do I change my zip code to postal code?
8. What is the biggest postcode area?
9. What does my postcode mean?
10. What is postal address example?

Tags

1. #postcode
2. #operational
3. #pressing
4. #spokesman
5. #sorting
6. #customers
7. #however
8. #normally
9. #unless
10. #routing
11. #request
12. #reason
13. #ensure
14. #process
15. #accurate
16. #postcodes
17. #there
18. #royal
19. #designed
20. #delivery
21. #change