I feel it is important to set any science fiction book into the context of the time the book was written. In this instance, the set of 10 books in the Space Series were written before Man had gone to the moon, although plans, I assume, were in motion. The series was published between 1955 & 1963.
W.E Johns is famous for his Biggles books, of which there are around 100. He did try his hand at other genres including a couple of romance novels, gardening magazines and books. However, it will always be his children's books for which he is remembered including Worrals, Gimlet, and Steeley. Some of my personal favourites are his Space or Science Fiction novels. As with all W.E. Johns’ books, they are good easy reading yet fast paced novels. Unlike some of the Biggles books which can become a bit formulaic, at the end of each Space series book there are unanswered questions which draw you straight into the next book - not so much a cliff-hanger, as in modern television, but more intrigue.