Below is reply from Isbank concerning charges. It appears that if you transfer money to your Turkish account and then withdraw it in TL its free, unless you ask for turkish charges to be paid at GB end, then they charge .5%. Dosen't make sense to me either ?
I'm sorry for the lack of tariff in my answer. Our tariff is as follows : 0.5 % being minimum USD 25 (or eqiivalent), maximum USD 500 (or equivalent) is requested from the sender bank if the sender bank has included the expression OUR in the MT103 Swift message. In other words, GBP quivalent of USD 500 would be requested from Barclays Bank for your transfer of GBP 120,000. But let me repeat my previous answer : You can avoid this charge if the sender bank does not write the expression OUR in the Swift message. Then the charges belong to the beneficiary. If the beneficiary draws the money in Turkish Lira, he doesn't have to pay anything.