Here's something for anyone who ever played spies as a kid: a book detailing sites connected with espionage around London. An Insider's Guide to 150 Spy Sites isn't an exposé of a bunch of shocking new secrets (the old MI5 HQ at Gower Street, for example, is common knowledge) but what's great is having it all packaged up so you can make your own walking tour (poison-tipped umbrella optional).
Fancy eating in the (tortured metaphorical) footsteps of Christine Keeler? Head down to Café Daquise in South Ken for Polish food and vodka - this is where she used to meet her Russian lover. Or check out the old dead leter drop at the Brompton Oratory. It's harking back to an era before spying was all about disabling your enemies' computer systems - blimey, we never thought we'd be wistful for the days of Cold War and imminent nuclear destruction.