As you say 'it is a well known problem' so if you if you go you make sure your purse /bag/ wallet is safe just like in London. Would you be stupid enough to walk down Oxford Street with a purse or wallet unprotected ??
Sadly its common now at all major tourist sites and in big cities. We were pick pocketed in Barcelona, as was a friend when she went to Sacre Cour in Paris. London is as bad if you look like a tourist.
Sorry, we can't find any related questions. Try using the search bar at the top of the page to search for some keywords, or choose a topic and submit your own question.