Boris Johnson says he understands parents' frustrations but the infection rate is "still very high".
The mother of Keon Lincoln, 15, who was shot and stabbed, pleads for information about his death.
Laboratory tests suggest antibodies can recognise and fight the UK and South Africa variants.
Louis Thorold's mother is in a critical condition after a van mounted the pavement.
Two hundred jobs are lost after it failed to reach agreement with the owners of the building in Edinburgh's Princes Street.