Here are the age 7 g scores from wave 4 of the Millennium Cohort Study. The kids were tested in 2008 using the British Ability Scale. The first column shows the gQ, the second column shows the standard error, and the last shows the sample sizes. The Black-White differences is a mere .36 SD. For comparison, Flynn and Dickens (2005) gives an age 7 US difference of .5 SD.
See also my post: Partially falsified