The number of people allowed to meet socially is being reduced from 30 to six from Monday.
Prime Minister Boris Johnson addressed the nation on Wednesday to announce the change of law.
The new rules come after a rise in coronavirus infections and apply to both indoors and outdoors, for all ages.
Exemptions apply to wedding ceremonies and funerals if they are conducted in a covid-secure way.
Restrictions do not apply if a household or support bubble is larger than six, or to places for work and education.
Writing in his weekly YLP column, North West Norfolk MP James Wild said the rules had to be strengthened and simplified.
“Six is the magic number,” he said. “Under the old rules some people were confused about how many friends and family they could meet and where.”