1. The school’s contact management policy does not conform to national standards 2. Inability to support in-school LFD testing (i.e. not part of the NHS Test and Trace Asymptomatic Testing Site network) Exclusion criteria for DCT (in the intervention arm): 1. Contact of a non-school index case 2. Household contact of a diagnosed COVID-19 positive individual 3. Symptomatic individuals

1. The school’s contact management policy does not conform to national standards 2. Inability to support in-school LFD testing (i.e. not part of the NHS Test and Trace Asymptomatic Testing Site network) Exclusion criteria for DCT (in the intervention arm): 1. Contact of a non-school index case 2. Household contact of a diagnosed COVID-19 positive individual 3. Symptomatic individuals