What happens if you miss a return flight?

Related questions

1. Can I use my Avios to book a flight for someone else?
2. Will Avios points expire?
3. How much does it cost to buy avios?
4. What if I miss my flight due to customs?
5. Can I use Avios to upgrade on BA?
6. Can I change my British Airways flight?
7. How many British Airways planes have crashed?
8. How many Avios will I earn BA?
9. Is avios free to join?
10. Is Flybe closing down?

Tags

1. #round
2. #cancelled
3. #airline
4. #extra
5. #return
6. #charge
7. #journey
8. #ticket
9. #could
10. #reprice
11. #after
12. #there
13. #theory
14. #contrary