From the NHS:
COVID-19 is a new illness that can affect your lungs and airways. It's caused by a virus called coronavirus.
The symptoms of coronavirus are:
a high temperature
shortness of breath
loss of sense of taste and smell
But these symptoms do not necessarily mean you have the illness. It is important if you experience any of these symptoms that you isolate immediately and seek the appropriate guidance through NHS 111 and book in for a test where possible.
The symptoms are similar to other illnesses that are much more common, such as cold and flu.