Two years since the start of the pandemic, the NHS is facing a new Covid crisis. The latest coronavirus variant, Omicron, is producing the biggest wave of infection yet, adding to the normal winter pressures and a waiting list that now stands at nearly six million in England. Panorama reporter Jane Corbin returns to University Hospital Coventry, where she was when the pandemic first hit, to see how staff are coping with a surge in cases and a shortage of colleagues and beds