What does GBG mean on a number plate?

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Tags

1. #island
2. #included
3. #background
4. #sometimes
5. #plates
6. #black
7. #white
8. #yellow
9. #containing
10. #registration
11. #international
12. #silver
13. #either
14. #backgrounds
15. #vehicle
16. #letters
17. #guernsey
18. #great
19. #britain