Prime Minister Boris Johnson has announced a series of measures to take effect from 4 July, easing the lockdown in England.
Meanwhile in Scotland, the five-mile travel limit is set to be lifted from 3 July, with more rules now expected to be eased later in the month.
From 4 July the 2m (6ft) social distancing guidance will change in England.
The prime minister said that where it is not possible to stay 2m apart, people should keep a distance of "one metre plus" - this means staying one metre apart, while observing precautions to reduce the risk of transmission.
Businesses are being asked to help by:
Northern Ireland has also announced it will reduce the distancing rule to 1m with restrictions.
In Scotland and Wales, the 2m distancing rule remains in place for the time being.
Restaurants, pubs and cafes in England will also be allowed to reopen, providing they follow safety guidelines.
All hospitality indoors will be table service only, and contact between staff and customers will be limited.
Customers will also have to give contact details when they enter a pub or restaurant.
Businesses will be expected to monitor crowd density in their premises, including at pinch points - such as doorways.
Business Secretary Alok Sharma said he expected people to use "common sense". But he added there was a "legal duty" for businesses to keep employees safe.
Holiday accommodation - including hotels, B&Bs, cottages, campsites and caravan parks - can also reopen, and people in England will be free to stay away from home overnight for the first time since lockdown began in March. But shared facilities - campsite toilets, for instance - must be cleaned properly.
Northern Ireland has also said that holiday accommodation can reopen for business from 26 June, and pubs and restaurants can open on 3 July. Decisions on hospitality and holidays in Wales are expected in early July.
In Scotland, the hope is that from 15 July all holiday accommodation can open up, along with indoor areas of pubs and restaurants and hairdressers and barbers. Beer gardens should be able to reopen from 6 July.
Shopping centres and dental practices in Scotland could fully re-open from 13 July.
In England, two households of any size will be able to meet indoors or outside. It will be possible to stay overnight.
This does not have to be the same set of households - the prime minister said. "It will be possible for instance to meet one set of grandparents one weekend, and the others the following weekend."
However, the government does not not recommend meetings of multiple households indoors because of the risk of infection.
In addition, the two households would have to maintain social distancing - unless they were part of the same support bubble.
Outdoors, people from multiple households can meet in groups of up to six - but two households can meet regardless of size.
From 6 July, people who are clinically vulnerable and are "shielding" will be able to gather in groups of up to six people outdoors, including individuals outside of their household, and form a 'support bubble' with one other household.
In Scotland, people should be able to meet indoors with two other households from 10 July.
In Northern Ireland, groups of up to six people not in the same household can now meet indoors while socially distancing.
In Wales, any number of people from two different households can now meet outdoors - but meetings indoors are still not allowed.
Content available only in the UK