I bought this book after deciding that I was fed up of looking at cryptic crosswords and feeling stupid, and with this book I am now a slow, but regular, cryptic solver. The book doubles as an explanatory essay and reference (for common acronyms) and features 13 practice puzzles too try. I had a lot of fun working through this book and I recommend it to anyone who has even a passing interest in improving their cryptic crossword skills.
Mike Ollerton is a vehement supporter of mixed ability teaching and in this book gives 100+ ideas to help maths teachers in doing it themselves, but even if your school uses setting the ideas here still work wonderfully. Anything written by this man is gold. Check it out it is absolutely brilliant!
...the work of John Mason is vitally important to mathematics educators the world over whether they know it or not. A truly great man with such insight, such depth of thought it's hard to believe at times. If you haven't checked out Thinking Mathematically yet, then do so...it could change your life!