CDC symptom checker : https://www.cdc.gov/coronavirus/2019-ncov/symptoms-testing/symptoms.html (recommends a test if you have a sniffle)

ONS Data – 27th Jan https://www.ons.gov.uk/peoplepopulationandcommunity/healthandsocialcare/conditionsanddiseases/articles/coronaviruscovid19infectionsinthecommunityinengland/characteristicsofpeopletestingpositiveforcovid19inengland27january2021

Biobank https://www.ukbiobank.ac.uk/media/x0nd5sul/ukb_serologystudy_report_revised_6months_jan21.pdf

RCGP flu surveillance

Covid 19 symptom survey https://b6bdcb03-332c-4ff9-8b9d-28f9c957493a.filesusr.com/ugd/3d9db5_bf013154aed5484b970c0cf84ff109e9.pdf