Government is set changed the isolation timeframe for people with coronavirus symptoms from 7 to 10 days.
Effective from today, it comes after findings show a “real possibility” of people being infectious for longer.
It is not yet clear if Wales, Scotland and Northern Ireland will adopt the same policy.
Those who have come into close contact with someone who has tested positive for COVID-19 will still have to stay at home for the same amount of time – 14 days.
However up until now, those with a continuous cough, a fever or any coronavirus symptoms had to isolate for a week.
The move follows health secretary Matt Hancock telling Sky News he is “worried” about a second wave following a rise in cases in Europe and the flattening out of the new cases decline in the UK.
He said the UK must “do everything to prevent it reaching these shores.”
Adding: “It’s something I worry about and I worry about it because we can see it coming.”