Why does Great Britain have a flag?

Related questions

1. Why is British flag called Union Jack?
2. What is the symbolism of an upside down flag?
3. Is it illegal to throw away a flag?
4. Does Great Britain have a flag?
5. What is nationality British or English?
6. Is wearing a flag disrespectful?
7. What happens if a flag touches the ground?
8. Why should a flag never touch the ground?
9. What is unique about the UK?
10. Why is UK famous?

Tags

1. #creation
2. #kingdom
3. #official
4. #create
5. #union
6. #patrick
7. #united
8. #britain
9. #great
10. #saint
11. #added
12. #ireland
13. #present