How far back can you claim Avios points?

Related questions

1. Is BA Executive Club the same as Avios?
2. What food is served on British Airways?
3. Do British Airways Executive Club miles expire?
4. What are Tier Points?
5. What's happened to my Avios points?
6. Do you get tier points when using Avios?
7. What does premium economy mean on British Airways?
8. What's the difference between avios and BA Executive Club?
9. What is the British Airways Executive Club?
10. Do I lose my Avios points?

Tags

1. #joining
2. #online
3. #flown
4. #months
5. #before
6. #within
7. #british
8. #flight
9. #claim
10. #members
11. #points
12. #three
13. #using
14. #account
15. #flights
16. #missing
17. #avios
18. #airways