Boris Johnson has urged the nation to “behave responsibly” when pub gardens reopen and restaurants resume outdoor dining in England on Monday.

In the next major step in the easing of England’s coronavirus lockdown, shops deemed non-essential will also reopen, as will hairdressers, indoor gyms, swimming pools, nail salons and zoos.

However, social mixing indoors will remain heavily restricted, with around two in five adults yet to receive their first dose of a COVID-19 vaccine – and the vast majority yet to get both.

The prime minister, who has postponed his long-awaited pub garden pint out of respect for the late Duke of Edinburgh, has urged caution during the “major step forward”.

Mr Johnson said: “I’m sure it will be a huge relief for those business owners who have been closed for so long, and for everyone else it’s a chance to get back to doing some of the things we love and have missed.

“I urge everyone to continue to behave responsibly and remember ‘hands, face, space and fresh air’ to suppress COVID as we push on with our vaccination programme.”

In England, pubs and restaurants have been making changes during lockdown to maximise their ability to serve customers outside.

But the British Beer and Pub Association estimates that just 40% of licensed premises have the space to reopen for outdoor service.

The previous 10pm curfew rule and the requirement to order a substantial meal with a drink have been scrapped, but social distancing must be observed.

Domestic holidays can resume to an extent, with overnight stays permitted in self-contained accommodation, such as holiday lets and campsites where indoor facilities are not shared.

But these can only be used by members of the same household or support bubble.

International holidays remain banned until an unknown date, amid a row over the cost of testing.

People will not be allowed to visit each other’s homes, with socialising indoors still prohibited outside support bubbles.

It will be the third in a series of easings since the third national lockdown was legally imposed in England on 6 January.

The next significant date is 17 May, when socialising indoors will be permitted under the “rule of six” – if the prime minister judges that the vaccination programme is safely breaking the link between infections and deaths.

Meanwhile, Wales will also enjoy renewed freedoms from Monday, with non-essential retail reopening and border restrictions eased to permit travel again with the rest of the UK and Ireland.

Remaining school pupils will return to face-to-face teaching in Wales and Northern Ireland, in moves being echoed in Scotland as pupils return from their Easter breaks.

The “stay at home” order in Northern Ireland will also end as the number of people permitted to meet outdoors rises from six to 10.

Professor Peter Horby, chairman of the New and Emerging Respiratory Virus Threats Advisory Group (Nervtag), told Times Radio: “The watchword has got to be caution, really.

“It’s not clear exactly when or how big it will be, but there is, I think, inevitably going to be a bit of a rebound in the number of cases when things are relaxed.”

The Oxford University academic said the vaccination programme will minimise hospital admissions and deaths but warned it will not be completely effective.

“I think we can be joyful and enjoy the freedoms but we’ve still got to realise there’s still a large number of people who’ve not been infected or vaccinated and so they will be at risk.”

After three months of full national lockdown, the government said on Sunday that a further seven people had died in the UK within 28 days of a positive COVID-19 test.

Around 61% of adults have received at least one dose of the vaccine, according to official figures suggesting that more than 32 million people have received a jab. More than 14% have had both doses.

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