In the mid-1960s, DC's distribution arm IND bought Thorpe & Porter (and its Top Sellers imprint). National Periodical Publications (DC) was then purchased by Kinney National Company in 1967/68, which merged in 1969 with Warner Bros.-Seven Arts and was renamed Warner Communications Inc in 1972.
During this time, Thorpe & Porter and Top Sellers were incorporated into Williams, which became DC's European publishing division. From about 1973 to 1976, Top Sellers and Williams comics carried the Warner Communications stylised "W" logo. Warner sold the Williams group in 1976, although the name continued on some European publications until at least 1978.
It is reported at www.comicpriceguide.co.uk that the first issue of this series is actually remaindered (unsold) copies of #7 in the previous series with the addition of a sticker in the top left hand corner stating "No.1 Fortnightly".
Issues with numbers from #115 and cents pricing that are published by Top Sellers/Williams belong to separate, but similar-looking, Australian-distributed series: www.comics.org/series/95388.