There are fears a second coronavirus peak expected in the winter could kill 60 people a day and overwhelm the NHS.
Super-spreading clusters in places such as meat-packing factories could thwart efforts to control the deadly virus, say experts.
There is good news amid the bad as two experts are predicting the number of new UK cases of Covid-19 could finally drop to zero next month, reports The Mirror.
However, another model suggests Britain is likely to be hit by a second wave in early 2021.
It could be avoided, though, if a better track and trace system kept case numbers low, researchers told the Times.
A second wave is expected to be much smaller with as many as 60 deaths a day, far less than the first peak in April which saw more than 1,000 deaths per day.
NHS Providers, which represents health service trusts, warned a second peak in winter - coupled with flu season - could overwhelm hospitals.
A model which suggests there could be no new cases in July was produced by Giulia Faggio, of City, University of London, and Franco Peracchi, of Georgetown University in Washington, DC.
They predicted each UK nation would reach the end of the first phase of the epidemic between late June and early July.
Scientists at University College London have said a second, smaller wave of coronavirus could hit after Christmas if deaths continue above 20 a day. Their model suggests it would peak at about 60 deaths a day.
They said it can be avoided if the number of Covid-19 deaths can be cut to zero this summer.
The researchers said a more effective track and trace programme could push the second wave back further.
Wales' First Minister Mark Drakeford has warned a local lockdown could be imposed on the island of Anglesey following a Covid-19 outbreak at the 2 Sisters chicken processing plant in Llangefni.
There have been 175 cases at the plant and production has stopped.
James Wood, of the University of Cambridge, said: “As we get to a lower level of infection, significant super-spreading clusters pose a significant risk.”
