An NHS London spokesperson said: “NHS staff are working around the clock to minimise the significant disruption to patient care following the ransomware cyber-attack and we are sorry to all those who have been impacted. Pathology services are integral to a wide range of treatments and we know that a number of operations and appointments have been cancelled due to this attack. We are still working with hospitals and local GP services to fully assess the disruption, and ensure the data is accurate. In the meantime our advice to patients remains, if you have not been contacted please do continue to attend your appointments.”