John Edwards is a genius. This book is one of those things you always think 'wouldn't it be a good idea if...' about. When I went to university I lent a copy to my (Saeson) housemates and all communication barriers were soon lifted.
This book is basically a first stab at comprehensively listing the idiomatic way in which us proper south Walians speak. The result is a book that although sometimes a bit dialectic, makes you stop and think about the way you talk to others (and even the way you think) if you're from the valleys. It's a celebration, though, not a snide comment about the way we speak, and that's what sets it apart for me.
Even if some of the phraseology is a little dated in today's cosmopolitan valleys (!) it's nice to keep a record of some of those words that my nan would have used. As a result there's a chance to resurrect certain words which may otherwise become extinct in an increasingly globalised newspeak-orientated type society. Words like 'cwtch' - how many people these days prefer to 'hug' instead? But as John points out, the difference between cwtching and hugging is as distinct as the difference between 'longing' and 'hiraeth'.
And the exercises at the end are absolutely fantastic to read out aloud if you're a bit out of practice with your Wenglish, like.
So enough prattling from me. This book, and its sequel 'More Talk Tidy' provide a fantastic inventory of a language and way of life that are fast dying out - long live Wenglish. Tidy!