Tragically, 21 deaths were recorded by London North West University Healthcare NHS Trust, which runs Northwick Park Hospital in Harrow and Ealing and Central Middlesex Hospitals.
It is the largest figure released so far for one day in any of the hospital Trusts here.
NHS England provided the following breakdown of where the deaths happened around London's NHS network:
Croydon Health NHS Trust - Three deaths
This Trust runs Croydon University Hospital in Croydon.
Guys and St Thomas' NHS Trust - One death
This Trust runs Guy's and St Thomas' hospitals in Central London.
Kingston Hospital Foundation Trust - One death
This Trust runs Kingston Hospital.
Lewisham and Greenwich NHS Trust - One death
This Trust runs Lewisham Hospital and Queen Elizabeth Hospital in Greenwich.
London North West University Healthcare NHS Trust - 21 deaths
This Trust runs Northwick Park Hospital, Ealing and Central Middlesex Hospitals.