Foreign visitors may be bemused by our relatively toothless bobbies with their funny hats and ineffectual truncheons, but the truth is they can't always be trusted when packing heat. A female officer has been removed from operational duty after she left her firearm in an Edgware Road Starbucks. With a bladder perhaps filled with one of the chain's venti soy frappucinos, the officer, who has not been identified but whose surname is suspected to......