Prime Minister Boris Johnson has urged the public not to move gatherings indoors if it rains, as parts of the UK brace themselves for wetter weather.
He said breaking the lockdown rules could “undermine and reverse all the progress that we’ve made together”.
Since Monday, more than two people have been allowed to meet outside in the UK, though rules vary in each nation.
Mr Johnson said measures were relaxed because the risk of transmitting coronavirus was lower outdoors.
Many people have taken advantage of the sunny weather as restrictions eased earlier this week in parts of the UK – even taking the PM’s advice to invite up to five people for barbecues in their garden.
But BBC Weather is forecasting cooler conditions and rain in the upcoming days – and Mr Johnson was particularly keen to stress that people’s response should not be to move their social gatherings indoors when rain falls.
At the government’s daily coronavirus briefing, the prime minster said: “Some of you may be tempted to move the gatherings you’ve been enjoying outdoors indoors out of the rain. I really urge you: don’t do that.
“The risks of passing on the virus are significantly higher indoors which is why gatherings inside other people’s homes are still prohibited.
“Breaking these rules now could undermine and reverse all the progress that we’ve made together.”
It comes as the UK recorded the deaths of another 359 people who tested positive for coronavirus.
One of the main reasons the government has been reluctant to allow people to meet in gardens until recently is that there is always the temptation to move indoors.
With wetter weather forecast, it is easy to see how those family barbecues could be forced inside. For many reasons, the transmission of viruses is less likely in the fresh air.
Research shows the virus thrives in crowded, indoor spaces.
When outdoors, it’s much less likely we come into contact with an infected surface and any tiny particles of virus (called aerosols) would be dispersed by fresh air.
The main danger comes from large droplets, and staying two metres away from other people – as social distancing guidelines recommend – should overcome that.
Inside all the risks are greater.
Some 39,728 people have now died after testing positive, bringing the UK close to becoming the second country in the world to pass 40,000 deaths, with only the US recording more.
The government’s chief scientific adviser Sir Patrick Vallance said deaths were “not coming down as fast as we would like”.
He said the UK still had “relatively large numbers” of new cases, which were “not coming down fast”.
“That gives relatively little room for manoeuvre. We have to tread very cautiously,” he said.
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The latest figures showed more than 1,800 a day had tested positive for the virus, but Sir Patrick said official estimates suggested the true figure was significantly higher.
But Mr Johnson said he remained keen that this week’s “cautious steps” in relaxing some of the lockdown rules could soon be followed by more concessions.
He said: “We want to take some more steps to unlock our society and try to get back to as normal as soon as possible. Eventually I would like to do such things as reducing the two-metre rule, for instance.”
Many businesses, such as bars and restaurants, have been calling for a rethink of the advice on how far people from different households should stay away from each other – arguing that the directive in several other countries is to leave a one-metre gap.
However, the government’s chief medical officer Chris Whitty said he believed the rule would need to stay in place “for as long as this epidemic continues”.
What are the rules on meeting up?
In England, groups of up to six people from different households can gather outside, in parks or private gardens.
In Wales, any number of people from two different households can meet each other outside.
In Northern Ireland, groups of up to six people who do not live together can meet outdoors.
In other developments:
- Plans to force almost all arrivals to the UK to isolate for 14 days were confirmed by the home secretary
- A fifth of people with negative coronavirus tests might have the virus, the chair of the Commons health committee Jeremy Hunt said
- All schools in Wales will reopen on 29 June and will be open to pupils from all year groups for limited periods each week
- A contact tracer working on the NHS Test and Trace scheme said she has not been asked to speak to anyone since she started work
- Business Secretary Alok Sharma is self-isolating at home after becoming unwell in Parliament
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