Since 1st April 2022, specific guidance for schools has been withdrawn as we all learn to live with Covid. The UKHSA (UK Health Security Agency) has provided information about dealing with respiratory infections including Covid-19. This can be found here – https://www.gov.uk/government/news/new-guidance-sets-out-how-to-live-safely-with-covid-19
The UK Health Security Agency has published the following easy to read booklet explaining what to do if you or someone in family or household tests positive for COVID-19.
Current advice is for children to stay at home for 3 days and keep away from people, if they have a positive COVID-19 test result.