This repository contains the R script used to conduct this analysis, supplementary material, underlying data and STROBE cohort study reporting checklist. *The supplementary material contains the following extended material:* • S1. Study population information • S2. Age-specific incidence rates of cough or fever • S3. COVID-19 incidences for scenarios C1 to C4 • S4. Full exploration of proportion requesting test values for each scenario: C1, C3 and C4 • S5. Full exploration of scenarios C1, C3 and C4 for each proportion requesting test value: 40%, 60%, 100% • S6. Estimated cough incidence rates in England • S7. Estimated fever incidence in England *This repository contains the following underlying data:* • data1_surv_com_week.csv (Survey completion rates) • data2_bl_exp.csv (Anonymised individual characteristics of participants) • data3_daily.csv (Daily symptom reports) • ONS_England_mid-2019_extracted_sex-reg-age.csv (Demographic data extracted from ONS mid-2019 estimates for England, Source: Office for National Statistics licensed under the Open Government Licence v.3.0) • ONS_UK_mid-2019_extracted_sex-age.csv (Demographic data extracted from ONS mid-2019 estimates for the United Kingdom, Source: Office for National Statistics licensed under the Open Government Licence v.3.0) • Virus_watch_results_adj_month_2020-12-22.csv (Virus Watch cohort study estimates for the incidence of cough or fever cases in 2020). • VW_monthly_cough_prop.csv (Estimates of the proportion of cough or fever cases which are not COVID-19 cases from Virus Watch cohort study).