It's probably "The Enchanted Forest and Other Tales" by Robert Crottet, which was published in 1949 by Richards Press, London, with an introduction by Eric Linklater and woodcuts by Eric King
£6.00 (+£3.25 p&p) here:
http://www.abebooks.c...%3D0%26kn%3Denchanted
Another possibility is "The Enchanted Forest. (Fairy Tales with Colour Plates)" by Ida Rentoul Outhwaite & Grenbry Outhwaite, published in 1921 by A & C Black, London
£7.49 + (£4.06 p&p) here:
http://www.abebooks.c...anted%26x%3D0%26y%3D0
"The Enchanted Forest", by Violet Brady (with illustrations by Gordon Browne) was also published in 1921, by Oxford University Press.
(Sorry, I can't find any copies offered for sale)
Those are the only items with 'enchanted forest' in the title, published in the relevant period and within the correct classification, listed in the British Library catalogue.
Chris