A total 33,630 new Delta variant cases have been discovered in the past week, Public Health England has revealed.
That was an increase of 12% on the 29,892 Delta infections recorded in England in the seven days to June 9.
In the previous week the case numbers had doubled, with the latest figures a sign the infection rate could be slowing.
The latest infection numbers take the total number of confirmed cases to 75,953, PHE said on Friday.
Boris Johnson delayed 'Freedom Day' for another month over concern at the rate of the strain's spread.
The fourth and final phased of his roadmap out of lockdown was shifted from June 21 to July 19, to give vaccinators more time to double-jab as many older adults as possible.
The PM laid out ambitious vaccine targets as he confirmed the goal posts were shifting.
He pledged that every adult in the UK would be offered a first dose by July 19, and two-thirds of all adults would be offered a second.
The Tories have faced criticism over not closing the UK's borders to India earlier.
Labour said the country should have been added to the travel 'red list' weeks earlier as the Delta variant first emerged in India, and began spreading there with devastating impact.
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