Rosemary Sutcliff’s books were graced with the work of major British illustrators: Charles Keeping, Alan Lee, Victor Ambrus, C Walter Hodges, Richard Kennedy, Ralph Thompson, and Emma Chichester Clark. The books they, and others, illustrated included: 
The Queen Elizabeth Story (1950), The Eagle of the Ninth (1954), Simon (1953), Chess-Dream in the Garden (1993)
Richard Kennedy
Outcast (1955)
The Silver Branch (1957), The Lantern Bearers (1959), Warrior Scarlet (1958) , Knight’s Fee (1960) , Beowulf: Dragonslayer (1961), Dawn Wind (1961), The Mark of the Horse Lord (1965), The Capricorn Bracelet (1973), Blood Feud (1976)
Rachel Birkett
Flame-Coloured Taffeta (1986)
The Hound of Ulster (1963), The Changeling (1974), A Little Dog Like You (1987)
Chess-dream in the Garden (1993)
The Minstrel and the Dragon Pup (1993)
Black Ships Before Troy (1993), The Wanderings of Odysseus (1995)
(List revised 17/4/92 in light of comments below)
ROSEMARY SUTCLIFF (1920-92) 
Thanks both.
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There’s a useful listing here of RS titles linked to illustrator. (Though I do see “Flame-Colored Taffeta” is missing its illustrator here- it was Rachel Birkett).
Has some good things to say about your website, too, Anthony :)
http://blog.moonshadowecommerce.com/WEBLOG-NAME/AuthorsIllustrators/st/rosemary_sutcliff/
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Sorry, but “Chess-dream in a Garden” was in fact illustrated by Ralph Thompson, whose wonderfully sensitive animal drawings graced the pages of many of Gerald Durrell’s earlier books.
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