Any business which has to comply with money laundering regulations (I'm required to comply and report to the authorities any client where there's an indication of a breach such as tax evasion) is required to pay particular attention to businesses/clients who have dealings with high risk countries. HM Treasury publishes a list if such countries:
Link to the latest list
Little surprise as to which country is the most high risk or the country with the next highest risk.
Quite a number of countries in the third risk category. There is one country in that list which may be surprising - that's Iceland (the country, not the shop).