Here's one of the earliest spin-off's from Tharg's Command Module: the DAN DARE POSTER MAGAZINE published in July 1977.
The one-shot repurposed Bellardinelli artwork lifted from the weekly: the cover comes from Prog 7, the interior strip was a cut-and-shunt job, assembled from the earliest issues of the weekly and the fold-out poster itself was reworked art originally found on the centre pages of Prog 12.
Sales - presumably - didn't meet expectations as it took Tharg's droids another 16 years before they took a punt at a second "Poster Prog". A run of poster magazines (dedicated to Judge Dredd, Nemesis the Warlock, Rogue Trooper, Slaine and Strontium Dogs) appeared between 1993 and 1995. That year also saw a brief run of five poster magazines dedicated to the JD movie.