Which football team has never been relegated from the top flight?

Related questions

1. Who has never been relegated from the top flight?
2. Which English football club has been in the top flight the longest?
3. How many teams will qualify for Champions League in England?
4. Can I sell my Arsenal season ticket?
5. Do you have to be a member to buy Arsenal tickets?
6. Why are Arsenal called Arsenal?
7. How many trophies have Arsenal won?
8. Who has won more trophies Arsenal or Chelsea?
9. Why are Arsenal called gunners?
10. How many cups has Arsenal won?

Tags

1. #chelsea
2. #seven
3. #liverpool
4. #premier
5. #aston
6. #tottenham
7. #manchester
8. #never
9. #united
10. #hotspur
11. #however
12. #villa
13. #currently
14. #since
15. #country
16. #existence
17. #division
18. #faced
19. #arsenal
20. #start
21. #england
22. #there
23. #everton
24. #clubs
25. #league
26. #english
27. #relegated