A new collection of documents leaked by Edward Snowden and analyzed by The Intercept reveals that MI5 collected significantly more data than it can use. MI5 confirmed it was collecting significantly more than it is able to exploit fully The agencys surveillance capabilities had grown significantly over the last few years MI5 was not able to analyse the vast amount of data gathered by its systems, the Secret Service admitted the difficulties in another secret report released by the Intercept. The difficulties were not unique to MI5, many other Intelligence Agencies faced the same problems.”]
Source: https://securityaffairs.co/wordpress/48161/intelligence/mi5-surveillancce.html