I heartily agree with DX Wombat. CAP413 is the only reference (in the UK, of course) and is so detailed with examples that it really makes most of the other books on the market (or the relevant sections of them) irrelevant. I would also say that, despite their air of apparent authority, one or two such publications are extremely inaccurate and/or misleading.
Having said that, there are still one or two little errors to be ironed out of 413!
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