Keir Starmer said the UK has been "very slow" on testing for Covid-19 as he grilled the government over a lack of protective equipment and the deaths of frontline health workers in his first Prime Minister's Questions since becoming Labour leader.Starmer challenged Dominic Raab, standing in for Boris Johnson, with concerns over the gap between the capacity for testing and the actual number of daily tests.He also questioned whether the government will reach the promised 100,000 tests a day by the end of the month.Starmer said: “The Health Secretary made a very important commitment to 100,000 tests a day by the end of April, but yesterday the figure for actual tests was 18,000 a day and that was down from Monday, which was 19,000 tests a day.