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takyon writes:

Snowden files have revealed the location and role of the PRESTON surveillance facility in London:

The "Big Brother" comprehensive national database system feared by many MPs has been built behind their backs over the last decade, and even has a name for its most intrusive component: a central London national phone and internet tapping centre called PRESTON.

PRESTON, which collects about four million intercepted phone calls a year, has also recently been used to plant malware on iPhones, according to disclosures by former NSA contractor Edward Snowden. The phones were then targetted for MI5 "implants" (malware), authorised by a ministerial warrant.

The location and role of the PRESTON tapping centre has never previously been publicly identified, although published Crown Prosecution Service guidance to senior prosecutors refers to secret "Preston briefings" which they can be given if tapping evidence in a case they are prosecuting reveals that a defendant may be innocent. (The guidance also notes that the briefing may be given after exculpatory intercept evidence has been destroyed.)

Located inside the riverside headquarters of the Security Service, MI5, in Thames House, PRESTON works alongside and links to massive databases holding telephone call records, internet use records, travel, financial, and other personal records held by the National Technical Assistance Centre (NTAC), a little known intelligence support agency set up by Tony Blair's government in a 1999 plan to combat encryption and provide a national centre for internet surveillance and domestic codebreaking.

[...] David Davis MP told The Register this week that "much of the debate for the last 15 years appears to have been a charade about data that the government very likely already held. It is also clear that the legislation that the government relied upon was being interpreted in ways that Parliament never imagined."

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