At least one NHS content editor uses "symptom" to mean objective symptoms [1]:

> Symptoms of coronavirus (COVID-19) in adults can include:

> - a high temperature or shivering (chills) – a high temperature means you feel hot to touch on your chest or back (you do not need to measure your temperature)

As do, slightly implicitly, all four of the UK chief medical officers [2]:

> The individual’s households should also self-isolate for 14 days as per the current guidelines and the individual should stay at home for 7 days, or longer if they still have symptoms other than cough or loss of sense of smell.

[1] https://www.nhs.uk/conditions/coronavirus-covid-19/symptoms/...

[2] https://www.gov.uk/government/news/statement-from-the-uk-chi...