It's a map of Great Britain showing each postcode area. You kind of either want that or you don't...
I suppose that if you want a review then I can tell you that it's well bound, on good thick paper and that the print is clear. Not much else really. Oh, the enlarged sections for city centres are handy, if you need a postcode area in a city centre of course.
As a mobile service engineer I live by post codes. When planning a run covering locations throughout a county or counties, it makes a very quick and useful guide to planning out the run. Saved me hours on the road, and coupled with the satnav is a god send.
Whilst this is a very nice quality book, the thing that I've found with it is that it's hard to see the postcodes as there's a lot of detail on the maps. I would have preferred less detail and clearer postcode areas. Otherwise a nice book that gives all the postcode areas at a reasonable cost.