The SOE Syllabus was a series of lectures given to prospective secret agents in Britain during the second world war. These “lessons in ungentlemanly warfare” were released from the top secret bit of the Public Record Office (now known as the National Archive) and published as a historical curio in 2001, when my esteemed colleague John Crace picked out the sillier bits in one of his Digested Read reviews. There was a whole lecture about how to craft a disguise, in which people with sticky-out ears were advised to use glue to pin them back.

But now, 24 years later, I have picked up the book with a graver purpose – just on the off-chance that if we end up having to resist a fascist state, the past might have something to offer. They won’t know everything, these ungentlemanly gentlemen, being as they didn’t have the internet. But they can’t have known nothing.

A lot of it is quite dated – struggling to comprehend the code system known as a “playfair cipher”, I realise that codebreaking technology has probably moved on in the intervening 80 years and I am making my brain ache for nothing. A section on political language, and how it should always be concrete – eg don’t say “hunger”,........

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