It always rains in november

Where: Along the Thames, London, England.
What: The taking of this picture - one that every visitor to London takes - prompted two members of the metropolitan police force of London to designate me a potential terrorist and start asking questions quoting section 44 of the ‘Terrorist Act’; it’s a government building after all. Luckily, I knew the right answer (’No.’) to their question (’Are you a terrorist?’).