The test to release scheme
If you are not fully vaccinated (you have not had your final dose of an approved vaccine at least 14 days before the date you arrive in England) and you’re travelling to England, you must quarantine at home or in the place you are staying for 10 days.
However, you can choose to book and pay for a PCR test on Day 5. If the result is negative (and the result of your day 2 test was negative or inconclusive) you can end your quarantine. You must still book and take your Day 2 and Day 8 tests.
The test to release scheme only applies in England.