Had a look at this insote today, and is a lovely set of two hard back books in a slip hard box cover. Lots of great colourful pictures, and my four year old loved it (although it's really aimed at older readers).
Had a look online, and it's £10 rather than the £25 instore I saw today. Free delivery also.
£16.25 at WHSmiths
£15.11 at Amazon (out of stock)
Discover more about the LEGO universe and their cult mini-figures with this unique slipcased set. Explore and celebrate the fascinating story of LEGO and its much-loved toys and games and find out all about their cult mini-figures with this fantastic slipcase containing two extraordinary books. From manufacturing wooden toys to blockbuster video games, go behind the scenes and discover fascinating facts and trivia about LEGO, one of the nation's best-loved companies. A fascinating timeline highlights key moments in LEGO history and special features spotlight groundbreaking achievements. Plus, celebrate each of LEGO's mini-figures with Standing Small, a unique look at these cult LEGO pieces. This work is a treasure trove for LEGO fans of all ages.
Decent review here; http://www.brickset.com/news/article/?ID=393