Some of these sites provide reviews and author information as well as selling books.
List of U.K. children's book publishers. Addresses and contact details. Lots of other stuff too.
Publishers of 'Little Books with Big Ideas'. Invaluable resource for Early Years
They have pages for young readers and
Simon and Schuster
Oxford University Press
Also has information on 'Oxford Reading Tree'.
'Belair' books about display and lots of others.
'Bags' of story related materials.