Horses in Training is an institution in racing - an indispensable tool for every racing enthusiast. Written in an easy-to-follow style, it is an encyclopaedia of invaluable information on the horses each trainer has in their care, with more than 18,000 horses and 557 trainers. The book lists alphabetically the British, Irish and French trainers, their horses, the owner and breeder of every horse, foaling dates of two-year-olds and the trainer's address and phone numbers. Fully indexed, it includes more than 150 pages of key statistics, covering everything from big-race winners to trainer tables, fixtures and racecourse information. The book is expertly edited by Graham Dench, a Racing Post senior reporter and former form book editor.

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“A gem that has stood the test of time: Horses In Training 2023 still does what it says on the tin. What it has done for some 130 years. It is a list of (nearly) every thoroughbred racehorse in training in Britain (and some in Ireland and France) – covering 557 trainers and over 20,000 horses. Is it the sort of book that you start on page 1 and find yourself looking at page 406 two hours later? Of course not. So why, then, did I find myself doing exactly that and almost unable to put it down as I moved through the alphabet?”