LONDON – The British government on Tuesday backed away from plans to have all primary school children return to school in England before the summer holidays, following concerns by principals that they could not meet coronavirus social distancing requirements if everyone returned.Education Secretary Gavin Williamson admitted that the goal for England's approximately 5 million primary schoolchildren from age 4 to 11 was not possible, given constraints related to classroom sizes, the need for social distancing and inadequate numbers of teachers.“While we are not able to welcome all primary children back for a full month before the summer, we continue to work with the sector on the next steps,” Williamson told lawmakers.