Internet "black boxes" will be used to collect every email and web visit in the UK under the Government's plans for a giant "big brother" database, The Independent has learnt.

Home Office officials have told senior figures from the internet and telecommunications industries that the "black box" technology could automatically retain and store raw data from the web before transferring it to a giant central database controlled by the Government.

Plans to create a database holding information about every phone call, email and internet visit made in the UK have provoked a huge public outcry. Richard Thomas, the Information Commissioner, described it as "step too far" and the Government's own terrorism watchdog said that as a "raw idea" it was "awful".