Published by Picture Puffins in 1968, I found this edition of Three Little Pigs in a bookshop in Holborn. Lucky find, I’d say.
Wikipedia’s biography of Wiliam Stobbs:
William Stobbs (27 June 1914 in South Shields, England – 6 April 2000) was an author and illustrator. From 1950 to 1958, he served as the head of the design department at the London School of Printing and Kindred Trades.
Stobbs won the 1959 Kate Greenaway Medal from the Library Association, recognising the year’s best children’s book illustration by a British subject. Two books were cited (a practice repeated only for 1975 and 1982), Kashtanka and A Bundle of Ballads, both published by Oxford University Press.
You can see other illustrations by William Stobbs here.