He worked for the Royal College of Art for 34 years, and also acted as consultant designer to Wedgwood, WH Smith and other British companies.
For the 1951 Festival of Britain, he co-designed the Lion and the Unicorn Pavilion.
Sir Hugh Casson wrote on Guyatt's retirement from the Royal College of Art in 1981, ".
all his life Dick Guyatt has readily accepted and punctiliously dealt with teaching, designing, consulting, illustrating, lecturing, administrating; bringing to each problem, however small, that same quality of the true professional, the ruthless determination to achieve by rational methods aims that have been conceived in passion."
[1] Gerald Beckwith, writing in The Independent after Guyatt's death, said "He was one of our last remaining examples of a genuine Edwardian gentleman, to whom the qualities of duty, fidelity, truthfulness and manners were paramount.