As author and illustrator, Keith Roberts did more than most to define the look of UK science fiction magazines in the 1960s. In addition to his BFSA Award wins, he was nominated for the Hugo, Nebula and Arthur C. Clarke Awards. He is perhaps best known for his seminal alternate history novel, Pavane, but his work covered a broad range of SF's tropes and settings, as can be seen from the titles collected in this omnibus: The Chalk Giants, Kiteworld and The Grain Kings.
More of a comment: Roberts produces the most immersive scene setting I have encountered. The notes he strikes are poetic text I feel I am witnessing. So lovely, I must pause and re-read passages. It may be too much for some, but for me, his evocation of experiences in the moment work to perfection!