Yes, the Platform 5 Locomotive & Rolling Stock pocket books linked to in the opening post are the definitive enthusiasts' guide to loco (and unit) technical data, liveries and allocations. The Combined Volume, as it's name suggests, rolls all four of the Pocket Books, with one each covering Locos, Coaching Stock, DMUs (And Light Rail Systems) and EMUs into one single bound publication: The Combined Volume is published later in the year, on the 1st of March, than the individual pocket books, which become available from the very beginning of the year they relate to and are generally accurate to late October of the preceding year, whilst the Combined Volume ostensibly includes updates to the information contained that is accurate to the beginning of the year in question.
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I can't speak for the ownership of that book, but I can tell you that it's both cheaper (albeit only 10p) and likely to be despatched more quickly if you buy from
Amazon.
I would encourage folk to order them direct from Platform 5 Publishing: They're a very friendly and tight knit bunch of people who have always been exceptionally efficient at getting orders out to people, even following the sad loss of their founding member, Peter Fox.