A five-day doctors' strike is set to have a "significant impact" on services at east London hospitals.
Barking, Havering and Redbridge University Hospitals Trust (BHRUT) has announced it will have to rearrange more than 1,000 outpatient appointment and more than 100 non-urgent surgeries due to a doctors' strike starting this week.
The strike will last from 7am on Friday, July 25 until 7am on Wednesday, July 30, and will affect both Queen's Hospital in Romford and King George Hospital in Goodmayes.
BHRUT has said it is "working hard" to cover maternity and emergency care, but that it expects the strike to have a "significant impact" on its services.
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In a statement, the trust said: "We are doing everything we can to minimise the number of appointments and procedures which need to be rearranged.
"Those who need urgent care, including cancer patients and those who have experienced longer waits, are being prioritised.
"If you are affected, we will contact you directly.
"If you don’t hear from us, it’s important you come in as planned."
The statement added that A&Es will remain open during the five-day strike but encouraged patients with non life-threatening conditions to first contact their local pharmacy, GP or call NHS 111.
Resident doctors - formerly called junior doctors - are striking after a compromise was not reached by the British Medical Association and the government over better pay.