The warning coincides with Public Health England releasing data indicating three quarters of under 50s admitted to hospital with the Delta variant are unvaccinated. England’s chief medical officer has spent the past four weeks working on a Covid ward.

He revealed on Twitter: “The great majority of adults have been vaccinated.

“Four weeks working on a Covid ward makes stark the reality that the majority of our hospitalised Covid patients are unvaccinated and regret delaying.

“Some are very sick including young adults. Please don’t delay your vaccine.”

PHE data published on Friday showed that, of the 113 of under-50s who died from the ‘Delta’ variant, two thirds were unvaccinated.

SAGE has also announced an increase in the R rate to between 0.9 and 1.2, up from a 0.8-1.0 from the previous week.

So far, more than three-quarters of all adults have been vaccinated with two doses of the vaccine.

Sixteen and 17-year-olds will be invited to book in for vaccinations before August 23.

A recent ONS report has showed Yorkshire and the Humber currently have the highest amount of people infected with the virus in England – with around 89,600 cases.

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On Friday, the UK recorded 37,314 more coronavirus cases.

This also included 114 deaths in the latest 24-hour period.

This has increased from 32,700 cases and 100 deaths from last Friday.