score:0
The answer from jcaron is wrong. I flew to UK and left in 1 day. The border police told me I just had to write that i'm exempt and show the plane tickets for the next flight to prove I am indeed going to leave. You don't have to book a test if you're in the UK for 1 day.
Upvote:3
Yes, you need to:
You can however leave before the 10 days are over.
All the details are available here: https://www.gov.uk/guidance/how-to-quarantine-when-you-arrive-in-england
Note that those are the rules for England. They are different in the other countries of the UK.
Note that they can fine you directly at the border when you arrive if you havenβt booked and paid for your tests. I suppose you could also be prevented from boarding your first flight, though I donβt know if airlines check that.