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I have had thoughts about this. The main thing I keep thinking is to keep E6 philosophy in mind. Meaning, that I would not have a single "Real World" character be higher than 6th level.
Other than that, you need to do actual research concerning modern day London. An alternate idea is to set it in another city. I ran a variation of this under 3.5e where the item they recovered was in the Parthenon in Nashville, TN. Imagine my delight with that idea being part of the Percy Jackson movie a few years later, lol.
You could stat out the modern NPCs using the [http://paizo.com/store/byCompany/s/superGeniusGames/pathfinderRPG/anachronisticAdventurers]Anachronistic Adventurers[/url] line of products. Or even [http://paizo.com/products/btpy8khn?The-Modern-Path-Heroes-of-the-Modern-World-20]The Modern Path: Heroes of the Modern World[/url].