Nash is primarily famous for his brutal war art, such as The Menin Road, strangely elegant though that painting is. He was actually out there in Ypres, amidst the bombs, mud and carnage, ending up with an official war artist role. He became disillusioned quickly: “It is unspeakable, godless, hopeless. I am no longer an artist interested and curious, I am a messenger who will bring back word from the men who are fighting to those who want the war to go on for ever. Feeble, inarticulate, will be my message, but it will have a bitter truth, and may it burn their lousy souls.”
He died in 1946. After WW1 he got into illustrating, often with a surreal, abstract or expressionist edge, and painted plenty of rural scenes, of which this is one. In WW2 he was back as an official artist for a while, and all of his work is of great quality. As you can see, Shell liked it so much (they commissioned it) that they continued to use it for a funky travel advert 37 years later. Anyway, the great man is currently the beneficiary of Tate Britain exhibition.