The prime minister warned the country “cannot be complacent” amid a rise in the prevalence of coronavirus in the community.
Measures due to be lifted at the start of August, including allowing small wedding receptions, reopening bowling alleys and casinos and pilots of larger gatherings in sports venues, were delayed for at least two weeks.
And in a strengthening of precautions, Johnson announced new face covering rules that will come into force on 8 August.
WHAT ARE THE CURRENT RULES?
People in England have to have their nose and mouth covered in shops and takeaway outlets or they could face fines of up to £100.
People using public transport must also wear face coverings, but this rule was in place before shops were included on 24 July.
Other indoor venues – including shopping centre, banks, railway and bus stations and airports – are also included in the rules.
WHAT ARE THE NEW RULES?
From Saturday, the list of places where you will have to wear face coverings will grow.
The prime minister said that face masks would be “encouraged” at more indoor areas, but those places will now face the same restrictions as the existing ones.