“Half a million British citizens' medical data was offered for sale on a Chinese website after a security breach at UK Biobank.”

• The claim states that half a million British citizens' medical data was offered for sale on a Chinese website due to a security breach at UK Biobank.
• While the exact number of citizens and the specific website are not definitively confirmed, UK Biobank has acknowledged an incident where anonymized data was advertised for sale on Alibaba by multiple sellers.
• The context provided indicates that the data was advertised for sale and that access was revoked from identified institutions.

The claim states that half a million British citizens' medical data was offered for sale on a Chinese website due to a security breach at UK Biobank. While the exact number of citizens and the specific website are not definitively confirmed, UK Biobank has acknowledged an incident where anonymized data was advertised for sale on Alibaba by multiple sellers. The context provided indicates that the data was advertised for sale and that access was revoked from identified institutions.