There was an instrument issue in the B cohort Education module for Wave 7. An error in the sequencing specifications meant that the records that had a difference of one year in their 2014 and 2016 grade levels were not asked the questions regarding any repeats of grade/level since last interview. These participants with a difference of only one year in their 2014 and 2016 grade levels were also the most likely to respond in the positive to the repeat year questions.

As a result, the data for which grade/year level was repeated (gpc47a2) and what was the main reason, or other reason, for repeating the grade/level (gpc47a3a, gpc47a3b) have been dropped from the Wave 7 data file. The data for whether a grade has been repeated or not (gpc47a6) has been derived for B cohort by using the grade indicated by the study child in Wave 6 and Wave 7.