Covid vaccine certificates will be made compulsory for crowded venues such as nightclubs in an attempt to boost jab uptake among young people, Boris Johnson has announced. Speaking at a new conference at No 10 he said: Nightclubs need to do the socially responsible thing and make use of the NHS Covid pass, which shows proof of vaccination, a recent negative test or natural immunity – as a means of entry. As we said last week, we do reserve the right to mandate certification at any point, if it is necessary to reduce transmission. And I should serve notice now that by the end of September, when all over 18s will have had their chance to be double jabbed, we are planning to make full vaccination the condition of entry to nightclubs and other venues where large crowds gather. Proof of a negative test will no longer be enough. Johnson also said that he did not want a situation where people are asked to “produce papers” to get into pubs but did not rule it out. He said: We reserve to do a right to do what is necessary to protect the public. He defended the current isolation rules for contacts of people testing positive, saying they were “one of the few shots we have got left in our locker” following the easing of restrictions. But he said a small number of critical workers would be able to use regular testing as an alternative to isolation before 16 August, when all fully-vaccinated people will be able to do this. He said: I want to assure you that we will protect crucial services including the staffing of our hospitals and our care homes, the supplies of food, water, electricity and medicines, the running of our trains, the protection of our borders and the defence of our realm, by making sure that a very small number of named, fully vaccinated, critical workers are able to leave their isolation solely for the work I have described. Sir Patrick Vallance, the government’s chief scientific adviser, said hospitalisations could rise “quite a lot” higher than 1,000 per day over the summer. He said: The models are saying it is very likely we will get to above 1,000 hospitalisations a day, it could be quite a lot higher than that, and there will be deaths associated with that. He also said he would like to see case numbers falling by September, because the return of pupils to school then would put more pressure on the system. Johnson did not rule out raising taxes to pay for reform to social care. Asked about reports that he favours some sort of tax increase to fund a plan costing up to £10bn a year, he replied: All I can say is we’ve waited three decades, you’re just going to have to wait a little bit longer. I’m sorry about that but it won’t be too long now, I assure you. Children in the UK will get a Covid vaccine only if they are over 12 and extremely vulnerable, or live with someone at risk, as scientists raised concerns about inflammation around the heart linked to the Pfizer jab. That’s all from me for today. But our coronavirus coverage continues on our global live blog. It’s here.