A painter who trained at Chelsea School of Art where he studied under Henry Moore and Graham Sutherland. This was followed by a period at Ben Nicholson's studio in Paris. With the encouragement of Nicholson and the other St Ives-based painters, he founded the Mousehole Group Art School in 1936, in collaboration with George Lamborn and Guy Allen. This venture was only short-lived, but these early experiences stood him in good stead when he applied his graphic talent to advertising campaigns and book illustrations. During this time his work was shown widely in London.
Sayer was also a natural teacher and by 1966 this had become his full-time career until his retirement in 1982 as Head of Art at Chelsea & Westmintser Adult Education Institute. He died in Fulham.
His middle name was registered at birth as 'Latimer'.