This page from GCHQ’s internal GCWiki, last updated on 1 May 2012 documents progress in a variety of the agency’ projects: see Facing Data Deluge, Secret U.K. Spying Report Warned of Intelligence Failure, 7 June 2016.
This concluding slide from an undated GCHQ presentation on Tempora reminds analysts that they are in a “enviable” and “privileged” position – “you have access to a lot of sensitive data… have fun and make the most of it”: see the Guardian article Mastering the internet: how GCHQ set out to spy on the world wide web, 21 June 2013.
This GCHQ presentation from 23 March 2009 discusses the agency’s plan for “processing Events [metadata] at scale”: see the Intercept article Profiled: From Radio to Porn, British Spies Track Web Users’ Online Identities, 25 September 2015.
These July 2009 documents provide a full list of the fibre-optic cables GCHQ had access to at that point, including details of location, bandwidth and corporate partners: see the Süddeutsche Zeitung article Snowden-Leaks: How Vodafone-Subsidiary Cable & Wireless Aided GCHQ’s Spying Efforts, 25 November 2014.
These screenshots from GCHQ’s internal GCWiki describe progress on the MTI (Mastering the Internet) cable access project, also known as Tempora. Prominent within these reports is the close cooperation with corporate partner Cable & Wireless / Vodafone, codenamed GEROTIC: see the Süddeutsche Zeitung article Snowden-Leaks: How Vodafone-Subsidiary Cable & Wireless Aided GCHQ’s Spying Efforts, 25 November 2011.
This page from GCHQ’s internal GCWiki, last edited in May 2012, provides background information on the agency’s “internet buffer business capability”: see the Der Spiegel article The NSA in Germany: Snowden’s Documents Available for Download, 18 June 2014.