The public are being asked to avoid under-pressure Northwick Park Hospital while it moves to a new A&E department.
The planned opening of the new unit at the hospital, in Watford Road, Harrow, on Wednesday 10 December, will require the four hour divert of A&E services from midnight on Tuesday, December 9 until 4am on Wednesday.
A spokeswoman for the London North West Healthcare NHS Trust said: “The public are asked to avoid coming to the hospital during this time.
“A lot of careful planning has taken place to prepare for the move. Staff are working with neighbouring NHS Trusts and London Ambulance Service to ensure that everyone is prepared for the move.”
London Ambulance Service will not transport patients to Northwick Park Hospital during those four hours, while two teams of staff working during the move will ensure that patients in the existing A&E still receive treatment while the move takes place.
This week, paramedics were told to call ahead before bringing patients to the hospital.
Members of the public who require treatment during this time are asked to consider alternative options and should call NHS 111 in the first instance.