Labour glitch put voting intentions data of millions at risk

Exclusive: Experts say sensitive information could potentially have been harvested and used for targeted election interference

The voting intentions of millions of Britons in local authority wards across the country could have been at risk of misuse as a result of a glitch in the Labour party's main phone-banking system, the Guardian understands.

Experts had warned that the sensitive data could potentially have been harvested via an automated programme and used for targeted election interference by campaign groups or even hostile states.