coronavirus vaccine.Figures on Sunday show the Government's target of offering a Covid-19 jab to the four highest priority groups by Monday has been beaten.The milestone is key to the lockdown exit strategy for England, which is due to be unveiled by Boris Johnson on February 22.Britain became the first country in the world last December to approve a Covid vaccine, when regulators gave the green light to the Pfizer and BioNTech jab.The Prime Minister had pledged last month to offer vaccines to everyone in the four groups.This includes the over-70s, care home residents and staff, frontline health and care workers and the clinically extremely vulnerable.He tweeted: "Today we have reached a significant milestone in the United Kingdom’s.