The British Polling Council (BPC) is today announcing its findings in respect of a complaint from Mr Dominic Cummings of Vote Leave about a survey of members of the CBI conducted by YouGov in June and July 2013.

The BPC’s principal aim is to ensure that its member companies are as transparent as possible about the methods that they use to conduct their polls. It does not adjudicate on the merits of the methodologies that are used in polls — and consequently it has not done so in this case. Our findings do not represent in any way a judgement on the merits of the methodology used by YouGov in the CBI poll.

Under its Rules, any complaint to the Council is in the first instance considered by the officers. If they determine that the Rules may not have been fully observed, the matter is drawn to the attention of the member company in question. Should the company agree to take any necessary action, the matter is then considered to have been resolved.

As indicated in a press release issued by the BPC on 2 November, because his initial view on the complaint had inadvertently become publicly known, the Secretary of the BPC, Mr Nick Moon, took no part in the handling of this complaint. It has been handled throughout by the President of the BPC, Prof. John Curtice, and the BPC Committee Member, Mr. Simon Atkinson.

The officers took the view that the complaint made two points that were relevant to the Council’s Rules.

• That YouGov had failed to make clear whether and how the data in the survey had been weighted.
• That YouGov had not provided an adequate explanation of the sampling procedures that had been used to conduct the survey.

On the first, the officers took the view that there were not sufficient grounds to uphold the complaint. On the second the officers noted that YouGov had supplied details of the sampling procedures to Vote Leave on request, but that this information was not publicly available on its web site. While YouGov’s website does provide a full description of how they conduct their regular polls amongst members of the general public, that statement did not cover this particular survey.

YouGov have corrected this omission and appended to the detailed tabulations of the CBI poll that are available on its website an explanation of the sampling procedures that were used to conduct the poll. Accordingly, the matter is now considered to be resolved.

Notes to Editors

1. The BPC does not usually issue a press statement in respect of complaints that are made to it. It has done so exceptionally on this occasion because of the media publicity and interest that surrounded the original lodging of Mr Cummings’ complaint.
2. The Objects and Rules of the British Polling Council can be found at Objects And Rules
3. The detailed tabulations for the CBI poll can be found at YouGov / CBI Survey Results
4. The methodological statement that has been appended to these tables reads as follows:

This was a survey of members of the CBI.

A list of members was given to YouGov by the CBI. All were invited to complete the survey, both by sending a letter and a paper questionnaire to their business address and by sending an online link to the survey by email.

To maximise the response rate the survey was left open for completion for a period of six weeks (from 13th June to 30th July 2013). During that time non-respondents were sent two reminder emails and contacted by telephone to encourage their participation.

The final number of responses was 415.