More than 44,000 people have formally objected to NHS England using their personal health data in the Palantir-powered Federated Data Platform (FDP). The objections invoke data protection rights and require the NHS to stop processing the data unless it can show compelling grounds to continue. The campaign adds pressure on the government over a £330m contract, amid criticism of Palantir’s work for the Israeli military and US immigration enforcement.

The FDP is intended to link NHS information, including surgery schedules and discharge planning; Palantir says it is helping reduce waiting lists and reports increases in operations and improvements in discharge delays and cancer diagnosis times. Campaigners dispute whether its public health benefits justify the arrangement and raise concerns about trust and data confidentiality. Palantir says data remains in the UK and is handled only on NHS instructions, while NHS England says organisations retain control and that it will respond to objections under data protection law.