Experts on the government's Scientific Advisory Group for Emergencies (SAGE) announced on Friday the estimated R rate of coronavirus infection across Britain is between .9 and 1.1.
The growth rate of coronavirus transmission, which reflects how quickly the number of infections is changing day by day, has also changed slightly across the UK since last week, with early indications the value may be increasing.
The latest growth rate for the whole of the UK is between -2% and +1% which means the number of new infections is somewhere between shrinking by 2% and growing by 1% every day. This is a slight increase from between minus 3% to plus 1% last week.
The R number represents the number of people each Covid-19 positive person goes on to infect.
In England, the R is between is between 0.9 and 1.1, the same as last week.
As a result, the government website gov.uk says that SAGE does not have confidence that R is currently below 1 in England.
Recent changes in transmission are not yet fully reflected in the estimates because the data used to calculate R and growth rate reflect the situation from a few weeks ago.
The figures published each Friday are estimates and there is a high degree of uncertainty with them, experts say.
A time delay between initial infection and the need for hospital care usually means it may take between two to three weeks for the changes in the spread of Covid-19 to be reflected in the estimates.
The news comes as schools in England prepare to reopen after the summer holidays. Chief Medical Officer for England Professor Chris Whitty said this week that missing school could be worse than catching coronavirus for children.
However, experts have warned that while reopening schools has not been usually followed by a surge in Covid-19 transmission, it could push the reproduction rate – the R rate – above one across the country.
Large parts of the north of England are subject to local lockdowns, and areas including Birmingham and Slough were last week added to the government lockdown “watch list” after reporting rises in numbers of coronavirus infections.
Museums, bowling alleys and soft play centres have all reopened to the public, but with strict social distancing measures in place to try and prevent further rises in infection.
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