Fears about the impact on vaccines mean travel from six African countries had to be restricted, he adds.
NHS guidance says that ambulance handovers should be completed within 15 minutes.
A doctor alleges his role as a special adviser to England's healthcare regulator was ended unfairly.
Other groups have reported higher protection, but the results are still seen as a triumph.
A question everyone's asking: what's my Covid risk? Here's how to find out.
Borrowing - which hit a record £22.3bn in October - cannot go on indefinitely, chancellor says.