Whipps Cross Hospital is still facing IT disruption after Friday’s global cyber-attack as non-emergency patients are told to go elsewhere.

Barts Health NHS Trust, which runs the Leytonstone hospital, was one of the worst affected by the malware attack, which caused chaos at 45 NHS sites and in 100 different countries.

A statement from the trust today said they are no longer diverting ambulances from its hospitals with trauma and stroke care now fully operational.

There will be a reduction in planned services today and tomorrow to ensure they “continue to run safely”.

Some planned surgery and some outpatient appointments will go ahead, including all renal dialysis services.

A Barts Health spokesman said: “We are very sorry for any delays and cancellations that patients have experienced.

“Barts Health staff have been working tirelessly over the weekend, using tried and tested processes to keep patients safe and well cared for.

“Where we need to cancel planned appointments, we will be contacting patients directly to make them aware and we apologise for any inconvenience caused.

“It is possible that we will not be able to contact all patients that we need to speak to, so we apologise if we are unable to proceed with your treatment once you arrive at hospital.

“If you are not contacted and you are due to attend one of our hospitals for treatment on Monday and Tuesday then please attend as planned.

“Please bring your appointment letter, medication and any other information relevant to your appointment.

“We will prioritise clinically urgent planned appointments and our clinical teams are reviewing all our appointments to inform our decisions.”

Earlier this month, Barts Health had to cancel 136 operations across its five hospitals, along with hundreds of chemotherapy appointments, because of another IT problem.

The head of UK’s cyber security agency said experts are working “round the clock” to restore NHS systems, but there was no evidence of patient data being compromised.

The malware used to carry out the attack is called WannaCry and targets Windows operating systems.

It encrypts data files and blocks them from view before a screen appears demanding money to be able to access them.

The ransom is the equivalent of £230 in virtual currency Bitcoin.

The hackers have not yet been identified, but Home Secretary Amber Rudd said security services “must learn” from the attack.

For more information about other local health services please call 111 or visit www.nhs.uk.