Prime Minister Boris Johnson has been warned to detail a “road-map out of lockdown” by dozens of Conservative MPs as more people in England come under the toughest coronavirus restrictions.

Mr Johnson has been told by a group of 50 Tory backbenchers representing northern constituencies that the pandemic is threatening his election pledge to “level-up” the country.

More than eight million people in England – predominantly in the North – will be under the most stringent Covid-19 restrictions by the end of the week, with Warrington the latest area to be placed in Tier 3.

Nottingham and the boroughs of Broxtowe, Gedling and Rushcliffe will move into Tier 3 on Thursday, with details expected to be set out later on Tuesday.

The two areas will join the Liverpool City Region, Greater Manchester, Lancashire and South Yorkshire in Tier 3, placing 8.2 million people in England under the toughest restrictions.

The measures – which came into force in the early hours of Tuesday – mean pubs and bars must close unless they serve substantial meals.

Households are also banned from mixing indoors or in private gardens and beer gardens, while betting shops, adult gaming centres, casinos and soft play centres have been shut.

A man walks through Nottingham city centre wearing a face mask. Nottinghamshire has been placed into Tier 2 of the new coronavrius restrictions with meeting socially banned indoors and the rule of six applying outdoors.

The rate of coronavirus cases in Nottingham fell from 726.6 in the seven days to October 15 to 464.4 in the week to October 22, with 1,546 new cases.

The city had the highest Covid-19 rate in the country in the seven days to October 15, but was 22nd on a list of local authority areas by rate of new cases in the seven days to October 22.

In Warrington, however, cases rose from 343.3 to 395.2 per 100,000 people over the same period, with 830 new cases.

The latest announcement has sparked concern among Tory MPs, with the newly-formed Northern Research Group – led by former northern powerhouse minister Jake Berry – calling on Mr Johnson to set out a “clear road-map” out of lockdown.

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Mr Berry said: “The virus has exposed in sharp relief the deep structural and systemic disadvantage faced by our communities and it threatens to continue to increase the disparity between the North and South still further.

“Our constituents have been some of the hardest hit by this virus with many losing jobs, businesses, and livelihoods. Never has there been a more pertinent and urgent political and economic case to support people living in the North.

“However, instead of moving forwards on our shared ambitions, the cost of Covid and the virus itself threatens to send the North into reverse.”

A Number 10 spokesman said: “We are absolutely committed to levelling up across the country and building back better after coronavirus.

“We stood at the last election on a solemn promise that we would improve people’s lives, and although the pandemic has meant 2020 is not the year we all hoped it would be, our ambitions for the country are unchanged.”

Some 40 Conservative MPs have publicly signed the letter, while a further 14 have had their names redacted.

Meanwhile, Liverpool mayor Joe Anderson, whose brother Bill died with Covid-19, has backed the idea of a fourth tier of Covid-19 restrictions, telling BBC Breakfast: “It has taken untold damage on people’s wellbeing and a huge toll on families where people have died. If anything was required to bring it down faster I would do that.”