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It’s not often you leave your office in the City and see suited and booted business professionals immersed in their mobile phones, searching for an invisible object. Nor is it the case that teenagers have been excitable about leaving the house to go on a wild-goose chase, rather than watching the newest episode of Made in Chelsea.

Then came Pokémon Go.

Only a couple a months ago we saw the launch of this viral game and people headed...