Boris Johnson has warned that tougher lockdown measures may be needed as he announced that around 2.4 million vaccines for Covid-19 have now been put in people’s arms. The Prime Minister stressed that “now is the moment for maximum vigilance” amid increasing calls for tougher lockdown restrictions. Speaking to reporters, he said stricter lockdown measures may be needed “if we feel that things are not being properly observed”. During a visit to a vaccine centre in Ashton Gate Stadium, Bristol, the Prime Minister added: “As I speak to you today we’ve done about two million people, maybe a bit more. “We’re at about 2.4 million jabs all in across the whole of the UK.” It comes as Professor Chris Whitty warned the UK has not yet hit the peak of the current wave of Covid-19 infections, with the next few weeks being “the worst” of the pandemic for the NHS.