''Walker Illustrated Classics'' is a new series which brings together some of the best-loved stories ever told, illustrated by some of today's finest artists. These exquisitely designed books, with their magnificent words and glorious pictures, are a pleasure to read - and re-read. The classics have never looked so good!This title includes over eighty of the most memorable poems written in the English language, from William Blake's ''The Tyger'' to Lewis Carroll's ''Jabberwocky''. Selected by Children's Laureate Michael Rosen and accompanied by his lively biographical sketches and notes and Paul Howard's astonishingly varied illustrations, this is indeed a classic collection.