The part government-owned NHS performance watchdog Dr Foster said last month that hospitals were "full to bursting" as bed occupancy figures topped 85 percent.
Patient care and the smooth running of a hospital's service begin to be affected at this level, according to the report.
Last month, 95% of beds were occupied on average across the country.
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Armed police have taken part in a dramatic training exercise aimed at recreating the chaos of a Paris-style terror attack.
After a remarkably mild November - a notable mild start to the new month.
The Facebook founder revealed the plan as he and wife Priscilla Chan announced the birth of their baby daughter, Max.