Email several UK dealers on the off chance that they have one in the pile of unsalables.
Schools in the U. S. and Canada have sent these music books to the landfill. Libraries discard them to make rook for the latest romances and Disney books.
Very few dealers recognize that some odd people (like me) are interested in old school song books, which are tossed into the garbage (dust bin) or recycle box. There should be a handful of these packrat dealers in the UK.