https://111.nhs.uk/- symptom checker
https://www.nhs.uk/conditions/coronavirus-covid-19/symptoms/ - symptom checker and more general advice
Covid symptoms: Is it a cold, flu or coronavirus? This BBC video seems particularly useful
https://www.gov.uk/coronavirus Government site with comprehensive Coronavirus information
https://www.bbc.co.uk/news/health-54145299# BBC link to a visual guide of the difference in symptoms
These are the government's main symptoms for Coronavirus-
Most people with coronavirus have at least 1 of these symptoms.
The main symptoms of Covid-19 appear to be different to a common head cold which is often typified by runny nose, blocked nose, sneezing, headache etc.