This significantly disrupted services at prominent London hospitals, including King’s College Hospital Trust and Guy’s and St Thomas’ Trust.

The group released nearly 400GB of purloined data onto the dark web in the dead of night late last week.

The BBC has disclosed that this data trove includes sensitive patient information such as names, NHS numbers, and dates of birth. Authorities are currently investigating the breach.

While it remains unclear if the leaked data encompasses test results, reports suggest that the cache contains detailed business accounts, revealing financial interactions between Synnovis and various hospitals.

An NHS England representative has acknowledged the incident, stating, "We understand that people may be concerned by this, and we are continuing to work with Synnovis, the National Cyber Security Centre and other partners to determine the content of the published files as quickly as possible."

The spokesperson clarified, "This includes whether data is extracted from the Synnovis system, and if so, whether it relates to NHS patients."

The fallout from this cyber onslaught has been considerable, with 1,134 surgical procedures and 2,194 outpatient appointments deferred across the two hospital trusts since 3 June.