Does the UK have to join the euro by 2022?

Related questions

1. How much cash can you travel with in Europe?
2. Will the UK be forced to adopt the euro?
3. Is it illegal for shops to use Card Fees?
4. Is it illegal to have a debit card minimum?
5. Can a restaurant refuse cash?
6. Why is 500 a monkey?
7. Can you pay for something in pennies?
8. Can I use euro in England?
9. How much is a pound in England?
10. Is it illegal to not accept credit cards?

Tags

1. #denmark
2. #joining
3. #treaty
4. #lisbon
5. #adopt
6. #years
7. #members
8. #states
9. #within
10. #state
11. #moment
12. #member