In August 2020, Northampton saw an increase in the number of Covid-19 cases. A large number of these transmissions were traced back to the Greencore factory in Northampton. On 21 August 2020, workers and their households were told to self-isolate for 14 days to limit the risk of further spread of the disease in the community, and to avoid a local lockdown. This article looks at the regulations introduced to enforce the restrictions.