Can someone please teach the government how to use BCC?
Five batches of email, each with 100 recipients, were affected.
Eleven political parties were also issued with warning notices.
Labour expects to lose two million email contacts. All parties fear new data rules could be 'weaponised' by their enemies.
But don't you dare call it a monopoly!
Has the site lived up to its word?
PM says government has no 'current' contracts with data firm.