There were 634,026 cases in the week ending January 21, a 0.2 per cent rise on the number seen the week before.
It is double the number of cases the UK saw in the last week of November, before the Omicron wave.
The flat national picture disguises huge regional variations, with cases up by 26 per cent in a week in Northern Ireland and 20% in the South East of England but down by 21 per cent in Scotland and 15 per cent in the North East.
Case numbers include positive lateral flow tests in England and Northern Ireland but exclude them in Scotland and Wales, making comparisons across the UK nations difficult.
At neighbourhood level, Covid-19 case rates have been published to show cases from January 13 to January 20
Here are the neighbourhoods in the Arun district with the biggest rise in case rates in the past week.
![Littlehampton West and River had 1310.3 Covid-19 cases per 100,000 people in the latest week, a rise of 36.3 per cent from the week before. SUS-221002-111934001](https://www.chad.co.uk/webimg/T0FLMTM2NjE3NzQy.jpg?crop=3:2&width=640)
1.
Littlehampton West and River had 1310.3 Covid-19 cases per 100,000 people in the latest week, a rise of 36.3 per cent from the week before. SUS-221002-111934001
![Westergate, Eastergate and Walberton had 1473.9 Covid-19 cases per 100,000 people in the latest week, a rise of 19.8 per cent from the week before. Photo by Derek Martin Photography.](https://www.chad.co.uk/webimg/T0FLMTM2MDA3MTQy.jpg?crop=3:2&width=640)
2.
Westergate, Eastergate and Walberton had 1473.9 Covid-19 cases per 100,000 people in the latest week, a rise of 19.8 per cent from the week before. Photo by Derek Martin Photography. Photo: Hilsea Portsmouth
![Aldwick had 793.8 Covid-19 cases per 100,000 people in the latest week, a rise of 15.8 per cent from the week before.](https://www.chad.co.uk/webimg/T0FLMTM2MzM1NTAw.jpg?crop=3:2&width=640)
3.
Aldwick had 793.8 Covid-19 cases per 100,000 people in the latest week, a rise of 15.8 per cent from the week before.
![South Bersted had 1273.8 Covid-19 cases per 100,000 people in the latest week, a rise of 14.9 per cent from the week before.](https://www.chad.co.uk/webimg/T0FLMTM2MzM1NTM0.jpg?crop=3:2&width=640)
4.
South Bersted had 1273.8 Covid-19 cases per 100,000 people in the latest week, a rise of 14.9 per cent from the week before.