I work as a Western Union agent in the UK and they will also only transfer money INTO Turkey in dollars or Euros also, I also think that they are your most expensive option as their transfer charges are very high.I go along with LeedsUtd a bank transfer is your best option but there's no getting away from the fact that your money will have to be converted back to sterling and you will lose out at some point, as all banks use a different rate Turkish/ sterling than sterling/Turkish.