By Rob Picheta, CNN When the United Kingdom emerged from one of the world’s longest and most stringent coronavirus lockdowns in April, it did so believing that the worst of the pandemic was over. Prime Minister Boris Johnson touted the successes of the country’s vaccination rollout, and promised a “cautious but also irreversible” roadmap that would culminate on June 21, when the country would lift virtually all restrictions and return mostly back to normal. But that date was delayed, and normal still feels some way off in the UK. Despite boasting an inoculation program that has now fully vaccinated nearly two-thirds of British adults, the country is heading towards a potential third wave of Covid-19.