Does the UK have to join the euro in 2020?

Related questions

1. Can a restaurant refuse cash?
2. Can you pay for something in pennies?
3. What does money look like in England?
4. Can I use euro in England?
5. Are Euro accepted in London?
6. Why is the British pound worth more than the dollar?
7. Do you have to accept pennies as payment?
8. Is it illegal to have cash at home?
9. Do banks still accept pennies 2018?
10. How much is a pound in England?

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