Star Books
From Tardis Wiki, the free Doctor Who reference
Star Books was an imprint of W.H. Allen & Co. Just before Allen ceded control of Target Books to Virgin Books, they used their Star Books division help them burn off the stocks of Target novelisations they still had in their warehouses. Star never actually published anything with respect to Doctor Who, but instead just repackaged already-existing copies of Target Books' original print runs into a sort of "pseudo-omnibus. Star marketed these literally repackaged books under the name, Doctor Who Classics. These "double books" were released in 1988 and 1989. The series contained stories from each of the first four Doctors.