Abebooks don't seem to have heard of it, which surprised me.

You might try www.bookfinder.com

If you are anywhere in southwest UK you could try a visit to Hay on Wye, a small town but it is a whole collection of secondhand bookshops, including the country's biggest dealer.

If you can't find it there then there is a conspiracy to cleanse the land of our heritage, both my infant and junior schools seemed to have copies of this in every room and for every child.