evidence: If you go back to when we introduced mask mandates first. I think it was back in June or July 2020. Cases were going up very, very rapidly, and then the mask mandate actually brought them under control, oh, within weeks, within a couple of weeks." [...] In England, masks began to be required on public transport on 15 June 2020, and in shops on 24 July 2020. The Scottish Government began to recommend face coverings in April 2020, and they became mandatory in certain indoor settings in Northern Ireland in August 2020, and in shops in Wales in September 2020.