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The documents suggest that the operation was sanctioned in principle at a senior level in the government of the then prime minister, Gordon Brown, and that intelligence, including briefings for visiting delegates, was passed to British ministers.

A detailed report records the efforts of the NSA's intercept specialists at Menwith Hill in North Yorkshire to target and decode encrypted phone calls from London to Moscow which were made by the Russian president, Dmitry Medvedev, and other Russian delegates.

Another document records that when G20 finance ministers met in London in September, GCHQ again took advantage of the occasion to spy on delegates, identifying the Turkish finance minister, Mehmet Simsek, as a target and listing 15 other junior ministers and officials in his delegation as "possible targets". As with the other G20 spying, there is no suggestion that Simsek and his party were involved in any kind of criminal offence. The document explicitly records a political objective – "to establish Turkey's position on agreements from the April London summit" and their "willingness (or not) to co-operate with the rest of the G20 nations".

A second review implies that the analysts' findings were being relayed rapidly to British representatives in the G20 meetings, a negotiating advantage of which their allies and opposite numbers may not have been aware: "In a live situation such as this, intelligence received may be used to influence events on the ground taking place just minutes or hours later. This means that it is not sufficient to mine call records afterwards – real-time tip-off is essential."