From the letter to subscribers:

"...an Oxford University survery of 2,700 people in the UK found that Guardian coverage of Covid-19 has been substantially better than that of its newspaper rivals with twice as many Britons impressed by our work on the pandemic compared to any other British newspaper. This is a hugely satisfying verdict given how hard our teams have been working over the past six weeks. In a note to staff, our editor-in-chief Katharine Viner said: "Thank you very much, once again, for your brilliant work through this crisis. Your energy, resilience and commitment are inspiring."