The book is available direct from the author, unsigned or signed - signed copies cost £5 more, and the extra profit will be donated to Combat Stress, the UK's leading military charity specialising in the care of military veterans' mental health. Unfortunately as this is a large book, postage and packaging costs do apply.
Current status - first impression sold out; copies of the second impression (with errata corrected and a slightly updated cover image) are now available. All existing orders have been sent out. The total raised for Combat Stress so far is £305.
The book is, of course, also available to order from the usual "bricks and mortar" and online outlets such as Amazon UK. For overseas customers, the best value is likely to be had from The Book Depository as their prices include free worldwide postage to many countries (until they figure out they're making a loss...!). You can of course also order the book direct from the publishers, Crowood, and if you're in no hurry, both WH Smith and Pickabook are sometimes offering the book at a good price including delivery (the price jumps up to full RRP on some days, apparently at random, and stock levels fluctuate a lot).
Hardcover: 351 pages