Ofcom first conducted research, in association with research partner SamKnows Limited, into actual broadband performance for residential connections between October 2008 and April 2009, and published findings for this time period in January 2009 and July 2009. For the current, second round of research, from May 2010 to April 2012, we have updated this panel and now have more than 1,500 UK residential broadband users who have connected performance monitoring equipment to their router to provide the raw performance data. We believe that the integrity of our hardware-based technical methodology, combined with the scale of the project and the sophistication of the statistical analysis, makes this research the most robust analysis of fixed-line broadband speeds in the UK. This report sets out our findings from the first month of data collection (May 2010), during which more than 18 million tests were run.
Voluntary Code of Practice: Residential Broadband Speeds (updated) 2015, found on the Codes of practice page.