If agreement on new restrictions is not reached, the PM could impose tier three rules.
Work is under way to start trials in January where volunteers will be deliberately exposed to the virus.
A job support scheme will not be brought forward to the start of Wales' firebreak lockdown.
Restrictions mean inmates can be in their cells for 23 hours a day, says the chief inspector of prisons.
One family in London say they received scores of long, repetitive calls from contact tracers.