sir patrick vallance, the government s chief scientific adviser during the pandemic, has told the covid inquiry that the government s response to limit the spread of the virus in the early months was not, in his words, operationally effective. he said borisjohnson, who was prime minister at the time, had struggled to understand some of the scientific concepts that were presented. the inquiry is currently looking at decisions made by politicians during the pandemic. helena wilkinson reports. sir patrick vallance arriving at the inquiry in central london this morning ahead of giving evidence. he became one of the most recognisable faces during the pandemic. faces during the pandemic. patrick, over to yom faces during the pandemic. patrick, over to you. appearing faces during the pandemic. patrick, over to you. appearing at faces during the pandemic. patrick, over to you. appearing at daily - over to you. appearing at daily covid news over to you. appearing at daily c