"When the researchers used a new formula for calculating the rapid test's accuracy, they found LFTs were more than 80% effective at detecting any level of Covid-19 infection and likely to be more than 90% effective at detecting who is most infectious when they use the test.
This is much higher than previously thought, they say.
Prof Michael Mina, from Harvard School of Public Health, also part of the research team, said the LFTs could "catch nearly everyone who is currently a serious risk to public health" when viral loads are at their peak."
"The current government guidance saysthat if you receive a negative follow-up PCR test result, and this PCR test was taken within two days of the positive LFT, you will be told by NHS Test and Trace that you can stop self-isolating.
However, it states that you must continue to self-isolate if the PCR result is positive, you choose not to take a follow-up PCR or the test was taken more than two days after the positive LFT"
From BBC news 21st October 21
ie trust lfts, but not over and above pcr