The United Kingdom is on course to be able to lift most remaining COVID-19 restrictions on July 19, Prime Minister Boris Johnson said on Monday.

Johnson, whose government is again under fire after the resignation of his health minister Matt Hancock for breaking the restrictions, had hoped to unlock Britain's economy last week.

But with coronavirus cases rising, driven largely by the more transmissible Delta variant, the government postponed the date until July 19.

"With every day that goes by it's clearer to me and all our scientific advisers that we're very likely to be in a position on July 19 to say that really is the terminus and we can go back to life as it was before COVID-19 as far as possible," Johnson told reporters.

Hancock's replacement, Sajid Javid, said on Monday he wanted the restrictions to be lifted as soon as possible.

(With input from agencies)