We've got both UK & Turkish. Turkish A/C has better interest rate for savings BUT there is the problem of exchange rates; which at the moment are fluctuating wildly. Our Nationwide A/c doesn't charge for taking out TKL but that A/C earns UK interest rates. The tax reference is necessary if you have a Turkish bank A/c because you can put your money on deposit over the 'phone or internet, earn interest, and then the Government takes its toll on the interest.
Hope this helps, remembering that you are only paying tax on the INTEREST only - not the Capital.