But of course, being researchers, many of our readers were itching to get a look at the full data table on which our infographic was based. So here it is: the list of the top 100 UK-based research agencies, ranked by turnover. Figures are in £m and those marked * are estimates.

For analysis and interviews with the fastest growing agencies, click here.

^{How the information was compiled
Many information sources were used, including the financial and business press and related websites}

• ^{Companies House has been the principal source of comparative data in the public domain but reporting dates vary within the year. Most are December but a few are as early as February and March}
• ^{Annual reports of public companies}
• ^{Private companies have in many cases supplied their turnover data directly to us, particularly if they file only modified accounts at Companies House. In a few cases these are round numbers rather than precise figures}
• ^{For some companies turnover has been estimated, based on known turnover ranges in the Research Buyer’s Guide and other information}
• ^{Many participants in the MRS Annual Survey of the industry agreed to the publication of their turnover}
• ^{Figures relate to turnover by UK-based organisations regardless of the location of their ultimate ownership or of their clients}
• ^{The top 100 includes only companies engaged in the collection, processing, analysis, interpretation and dissemination of information about markets and social issues}
• ^{Companies that are wholly dedicated to data collection, panels and fieldwork are not included}
• ^{It should also be remembered that there are many successful and reputable enterprises whose turnover is below the threshold for inclusion in the top 100. It remains a huge advantage of the UK industry that it continues to generate start-ups and new entrants, some of which have very high growth rates from a modest base and constitute compelling business development case studies}