The main bits to take away from the article are: As of Monday, double jabbed individuals and under 18s who are identified as close contacts by NHS Test and Trace will be advised to take a PCR test as soon as possible to check if they have the virus and for variants of concern. People can order a PCR home test online or by calling 119, or going to a test site.

As double jabbed people identified as close contacts are still at risk of being infected, people are advised to consider other precautions such as wearing a face covering in enclosed spaces, and limit contact with other people, especially with anyone who is clinically extremely vulnerable. They will not be required to self-isolate while they wait for the results of the PCR test.

https://www.gov.uk/government/news/self-isolation-removed-for-double-jabbed-close-contacts-from-16-august