Get the latest on coronavirus. Sign up to the Daily Brief for information, explainers, how-tos, comment and much more.
Households in Preston will be banned from mixing indoors or in gardens from midnight, while restrictions already imposed on other regions will remain in place.
Measures banning mixing between families were due for inspection on Thursday, a week later they had been brought in for residents in Greater Manchester, parts of east Lancashire and West Yorkshire, in addition to Leicester.
The Department of Health and Social Care confirmed on Friday evening that current rules on parties in these regions would not be raised and that Preston would become the latest place to be included at a ban on families gathering in homes and gardens.
There were 61 new cases in Preston from the seven days into August 4, which is the equivalent of 42.6 cases per 100,000 people — up from 21.7 per 100,000 from the past seven days.
At the request of their local jurisdiction, Preston will now be added to a watch list as an “place of intervention”.
The authorities said advice will make clear that individuals shouldn’t be gathering with other families everywhere inside.
The restrictions on parties will be reviewed again next week, with any changes to be issued by Friday August 14.