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Some owners of Apple's new phones get an error message when trying to run the contact-tracing app.
"Detailed work" is going on between the four nations to manage the migration of students in December.
A further 1,433 positive cases were registered in the past 24 hours with largest increases in Glasgow and Lanarkshire.
Sending some children home may be the only way to control infection rates, a former adviser warns.
The new rules are needed but ministers must set out an exit strategy, Sheffield City Region's mayor says.
Greater Manchester Police says it has issued 52 fines since tier three rules came into force.
Masonry, bricks and bottles were thrown at officers following trouble in north Belfast on Friday night.
The party wants the Labour leader to apologise for Angela Rayner's "unparliamentary behaviour".
The council says the restrictions must be imposed earlier to "urgently" bring down case numbers.
A police and crime commissioner says people need to take personal responsibility over Covid rules.