Public Health England has released its latest technical briefing giving an update on the spread of variants under investigation and variants of concern.
That includes the three strains of Indian Covid and the South African variant.
The document details exactly how many cases have been detected in England region by region, and includes a map showing the latest hotspots.
It comes after the Government issued updated guidance for eight areas in England where the Indian variant is spreading rapidly.
People in those areas have been advised to take extra precautions around travel and socialising.
In the North West almost 40% of cases have been found to be the Indian variant.
One of the maps in the document shows the prevalence of positive Covid infections where the virus was found to be one of the new variants - which can be detected by looking for the S gene.
Number of cases with detectable S gene target
There are currently five variants of concern in England and eight variants under investigation.
Separate data for cases by local area suggests that only a small number of places in the UK are currently recording a rise in cases that is greater than the usual day-to-day fluctuation in numbers.
Of the 380 UK local areas, 169 saw a jump in Covid-19 rates in the seven days to May 22, based on the latest figures available for cases by specimen date.
But of these 169 areas, 113 recorded increases that were in single figures.
By contrast, Blackburn with Darwen in Lancashire recorded a week-on-week rise in rates of 168.3 (up from 145.0 cases per 100,000 people to 313.3), Clackmannanshire in Scotland saw a rise of 131.9 (from 29.1 to 161.0), and Bolton in Greater Manchester saw a rise of 125.5 (from 321.7 to 447.2).
Number of confirmed and probable VOC-21APR-02 (B.1.617.2 - Indian variant) cases, by region of residence as of 18 May 2021
Meanwhile, case rates in the vast majority of areas continue to remain at levels last seen in late summer or early autumn 2020, with around four in five areas currently recording rates below 30 cases per 100,000.
