Stirling in Scotland has the highest prevalence of the variant and cases are still going up.
Other areas of concern include Manchester, Rochdale and Bolton – the worst affected place during the third wave so far.
Scientists say the Delta variant is around 60% more transmissible than the Alpha variant, first identified in Kent late last year.
It had appeared that the most recent outbreaks were among young and unvaccinated people, raising hopes that deaths and hospital admissions can remain low.
However the latest data from Public Health England (PHE) shows case rates in England have risen among almost all age groups, with the highest rate among 20 to 29-year-olds.
Tim Spector, the lead scientist on the ZOE COVID Study app, said: ‘The Covid-19 situation in the UK has rapidly changed from one of the best performing nations to a nation again struggling with rising cases.
‘The rapid rise is likely down to two compounding factors; increased social interaction and a newly dominant variant that is much more transmissible.’
‘It’s no surprise that people are becoming fatigued with social distancing after a long 15 months of restrictions, which will only encourage the spread.’
The app uses data reported by its millions of users to predict the prevalence of Covid in certain areas so differs from the official figures which only include cases confirmed via positive test results.
ZOE estimates there are currently 11,908 new cases every day compared to 5,677 reported last week – an increase of 110%.
On average one in 543 people in the UK currently have symptomatic disease.
The UK is bracing for a further rise in cases over the coming weeks while officials continue to deliberate over whether to go ahead with the planned easing of restrictions on June 21.
Dr Jenny Harries, the chief executive of the newly created UK Health Security Agency, has warned the UK is ‘not going in the right direction.’
But she told a Royal Society of Medicine webinar that it was still too early to make a decision on ending lockdown and it will take another week before a clearer picture emerges.
‘Cases are rising, I think that is becoming clearer and modelling does suggest that we would start to see a further rise, not necessarily immediately but in coming weeks’, she said.
Get your need-to-know
latest news, feel-good stories, analysis and more
Thanks for reading the whole article. If you wish to get an daily update about Covid Indian variant: Map reveals 25 areas in UK where cases are rising fastest , click on the bell button to subscribe for the notifications.