The PM is to announce later whether the final stage of easing England’s lockdown will go ahead on 21 June.
Stage four of the roadmap would see all legal limits on social contact removed and nightclubs allowed to reopen.
Many scientists have said the move should be delayed amid rising cases but businesses say this could cost jobs.
The BBC has been told a delay of up to four weeks is being considered. On Sunday Boris Johnson said a final decision had not yet been taken.
He told a G7 press conference the government was still looking at the data and would make an announcement on Monday.
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On Sunday, Foreign Secretary Dominic Raab told the BBC’s Andrew Marr Show the government “don’t want to yo-yo in and out of measures” and the decision would depend on whether the link between infections and hospital admissions had been severed.
If stage four went ahead, venues and events would be allowed to operate without capacity limits and the cap on guests at weddings would also be lifted.
Even if these restrictions are removed, rules on face coverings and social distancing could remain in place, as reviews are continuing.
The prime minister has previously said the government must be cautious so any easing of restrictions is irreversible.
Rising infections in the UK are being driven by the Delta variant, first identified in India, which now accounts for 90% of infections.
It is believed to be around 60% more infectious than the Alpha variant, which was first identified in Kent and was previously dominant in the UK.
Prof Andrew Hayward from University College London, who is a member of the Sage group which advises the government, said easing more restrictions would “fan the flames” of rising infections.
He told the BBC’s Andrew Marr Show it was “clear” the UK would have “a substantial third wave of infections” but the question was how this would translate into hospital admissions.
On Sunday, the UK recorded 7,490 new cases of Covid-19 and eight deaths within 28 days of a positive test.
If it wasn’t for the Delta variant, the government would in all likelihood be announcing the go-ahead for a full unlock.
But a more infectious variant against which one shot of the vaccine works less well has created a problem.
That much can be seen from how quickly infection levels are rising. The trajectory we are on means we could see January levels of infection by the end of July.
Exactly what that means for hospital admissions is less clear. It is already obvious that while the vaccines have weakened the link between cases and serious illness they have not broken it completely – admissions are rising after all.
Early data suggests less than 5% of cases are ending up in hospital – half the rate seen previously.
But that still has the potential to cause 2,000 admissions a day if we did reach January levels of infection – twice what the NHS would see for all respiratory illnesses in a bad winter.
None of that is guaranteed, of course, and so a delay, government scientists are arguing, gives them more time to work out with confidence where we are heading – and it is even possible the immunity built up by the vaccines will have started to halt the growth by then.
The government has set out four tests that must be met for the next stage of easing restrictions to go ahead:
- The vaccine deployment programme continues successfully
- Evidence shows vaccines are sufficiently effective in reducing hospitalisations and deaths in those vaccinated
- Infection rates do not risk a surge in hospitalisations which would put unsustainable pressure on the NHS
- Its assessment of the risks is not fundamentally changed by new variants of concern
More than 41 million people in the UK have had a first dose of a coronavirus vaccine, while nearly 30 million have had two doses.
The Night Time Industries Association has warned any delay beyond 21 June would be “catastrophic” for sectors like nightclubs which have been forced to close since March last year.
It said businesses had already spent millions preparing to reopen on that date.
The UK Weddings Taskforce, an industry group, estimates that 50,000 weddings planned in the four weeks from 21 June could be cancelled if the lifting of restrictions is pushed back and that the industry would lose lose £325m for every week of delay.
Currently the number of guests allowed at weddings and other life events is limited to 30.
Some Conservative MPs also oppose a delay to easing restrictions, including members of the Covid Recovery Group of backbenchers.
Steve Baker, the group’s deputy chair, said imposing severe restrictions had “devastating consequences” on businesses and mental health and the UK needed to “learn to live with the virus”.
Labour’s Emily Thornberry said the decision over stage four of the roadmap was “the last chance” for the government to follow the science and communicate clearly with the public.
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