As a proud Londoner I've been on a fair number of themed tours of my home city; a rock 'n' roll bus tour, a tour of the Bank of England, and most recently, a Karl Marx walking tour: "Walkers of the world unite," I shouted just before the guide started, "You have nothing to lose but your heels".

I once even embarked on a very personal and utterly pointless pilgrimage of all the locations in the 1960s movie Blow-Up, culminating in a game of mime tennis in an obscure Southeast London park featured heavily in the film.

But there's one

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