The epidemiologist whose modelling helped shape Britain’s coronavirus lockdown strategy has said new restrictions will be needed in England “sooner rather than later” if the government is to prevent infections surging again. Prof Neil Ferguson, who resigned from the government’s Scientific Advisory Group for Emergencies (Sage), said the country was facing a “perfect storm” after controls were eased over summer. On Friday, Boris Johnson admitted in a speech that Britain was entering a second wave of coronavirus. It is understood he is preparing to impose nationwide measures to curb the spread of Covid-19. Johnson was spending the weekend in talks with officials in Downing Street, the Telegraph reported. They will be considering options including closing pubs and restaurants, or imposing 10pm curfews, and a nationwide ban on friends and separate households socialising. About 13.5 million people in the UK – one in five – are already in local lockdowns after the government introduced new measures in parts of the north-west of England, Yorkshire and the Midlands. Speaking during a visit to Oxfordshire, Johnson said: “We are now seeing a second wave coming in. We’ve seen it in France, in Spain, across Europe. It’s been absolutely inevitable, I’m afraid, that we would see it in this country.” Ferguson, who quit Sage in May after breaking the rules by receiving visits from his lover at his home, told BBC Radio 4’s Today programme that the current levels of infection were on a par with those in late February. “If we leave it another two to four weeks we will be back at levels we were seeing more like mid-March,” he said. “That’s clearly going to cause deaths, because people will be hospitalised. I think some additional measures are likely to be needed sooner rather than later.” He added: “We have in some sense a perfect storm right now of people, as they have been told to, getting back to normal – schools reopening, a surge in cases, so therefore the testing system is under strain.” With cases almost doubling in the space of a week and positive tests passing 4,000 on Friday, Downing Street is considering a significant escalation to create what a government source called “breathing space”. Ferguson said he did not think a second lockdown would be as restrictive as the first, but that the government needed to develop a set of sustainable coronavirus restrictions to avoid repeated lockdowns. “You can lock down and then completely relax and then lock down again. My own view is at the moment a temporary lockdown – it wouldn’t be like it was in March, it would be less restrictive than that – would pull down infection numbers to allow the testing system to cope a bit better. “But I think, actually, what we want is to have a set of sustainable measures through until we have a vaccine, not go through this cycle again.” Labour’s deputy leader, Angela Rayner, joined calls for Johnson to consider the rise in coronavirus cases. “We are deeply concerned with the sharp rise in infection rates. What we have seen over the last six months is the government still can’t get the basics right,” she told Today. “The prime minister has to convene a Cobra meeting this weekend. He has to look at the science and the evidence and he has to make sure the measures are in place, and a clear communications strategy on that, so people can do the right thing. “It has been absolutely shocking to see how monumentally they have failed at the testing, tracing, tracking system that they put in place.”