An additional 3,591 women have not received information about NHS cervical cancer screening, it has emerged.
Capita, the company contracted to send out the screening invitations, made the discovery while investigating an administrative error already known to have affected 40,000 women in England.
NHS England says there is no evidence of any harm having resulted from these issues, now dating back to 2017.
The women involved, and their GPs, are being written to.
The errors were