Definitely can't be used in Turkey, have a look at the Foreign and Commonwealth website on
http://www.fco.gov.uk/en/travel-and-liv ... pe/turkey#under the heading 'Health.'
I recently found out that even if you're in a country where you can use it, if it isn't on you when you need it then you can't use it. For example, if you are by the pool and you fall, if it isn't with you before you reach the hospital you cannot use it. How many people carry the card around with them all the time? I used to keep it in the safety deposit box where it was 'safe' but totally useless as it wasn't on my person. So an accident by the pool would mean a quick dash to the apartment to get the card. Ok if you're at the pool at your own apartment but no good if you're elsewhere.