Peter Barrett designed and provided the artwork for a set of United Kingdom postage stamps depicting dogs in 1979.
His illustrations for Birdwatcher's Diary, by Roger Lovegrove, in 1982 drew critical acclaim.
[citation needed] A biographical perspective of his work was published in 1986 by his wife Susan Barrett titled "Travels with a wildlife artist: the living landscape of Greece".
Peter Barrett illustrated reprints and collections of famous animal centric stories and books by Gerald Durrell, Desmond Morris and James Herriot.
He has also illustrated the 1987 Random House edition of the children's classic The Wind in the Willows, by Kenneth Grahame.