This was the 2nd Top Sellers series starting with a fortnightly frequency. Issue #7 of the first series was used as a new #1 - they stuck a sticker at the top left hand corner with N. 1 Fortnightly. Making good use of unsold copies to launch a new series!
Note: some PR issues may have no value. Selected issues in FN, VF or VF/NM may not exist in some titles.