It was pretty easy to pinpoint which of the many english language books is the official "English Language" representative, but I choose this book for two reasons, 1) It is priced in pounds, and 2) it was printed in England by Clays LTD for Penguin Books.
It is a bargain book... my children and I always laugh when we go to a big box book store and walk by the Bargain Book bin at the door. The we ask each other: "Why are bargain books bargains? - because they suck!" Well maybe now we know not all bargain books suck. At least in the UK!