The UK government relaxed the travel rules further for Travel to England. For travellers who are not fully vaccinated (including unvaccinated, partially vaccinated and those who have had the Sputnik vaccine), it will be possible to enter the UK without needing to quarantine provided that they have a negative pre-flight (antigen or PCR) test, a completed UK Passenger Location Form (PLF) and a ‘Day 2’ PCR test booked. The Day 2 test can be taken anytime after arrival and before the end of the second day after (the day of arrival counts as ‘Day Zero’). You do not need to isolate until the test is taken. If the PCR test result is unclear or positive, you should follow public health advice.
For travellers counting as fully vaccinated, no tests are required. You will only need your vaccine certificate and a completed PLF. Check if you qualify as fully vaccinated.
Current advice for travellers to Wales, Scotland and Northern Ireland remains more restrictive and similar to the previous rules for England (Sputnik vaccines not recognised and quarantine rules still apply). Further details can be found from the links on https://www.gov.uk/guidance/travel-to-england-from-another-country-during-coronavirus-covid-19?priority-taxon=774cee22-d896-44c1-a611-e3109cce8eae
Whilst the BSCC provides this information in good faith, it will not accept any liability for errors or mistakes. Check the rules yourself before travelling!