CambridgeshireLive has a map with a legend that reads:
The first confirmed case in Cambridgeshire was announced on March 10. A location was not made public. On March 14, there was four confirmed cases. By March 16, there was twelve. As of March 30, there have been 109.
Cambridgeshire County Council
There have been 278 confirmed COVID-19 cases in the area governed by Cambridgeshire County Council. This data is correct as of April 8, 2020.
At least 17 people who tested positive for COVID-19 have died at Addenbrooke’s Hospital in Cambridge. This data is correct as of April 8, 2020.
The notes to the map read:
While the map is accurate based on information that is publicly available, some cases and deaths may not be covered because locations are not revealed beyond local authorities.
Also, due to low testing numbers, the actual number of confirmed Covid-19 cases is likely to be much higher