<img src="/wp-content/uploads/2021/12/a15728d6098ca4ad1702553be5880a98.jpg" alt="Passengers get a Covid-19 test at a Testing Centre at Heathrow Airport in London." /> <img src="/wp-content/uploads/2021/12/baf5cb0771e715588c2884fcbb620f9a.jpg" alt="Pedestrians walk on a street in Barcelona, Spain, on 27 December." />
