The official currency of Turkey is the Turkish Lira.
The currency consists of notes and coins, the most frequently used coins being 5kr, 10kr, 25kr, 50kr, 1 Turkish Lira and the most commonly used notes are 5, 10, 20, 50, 100, 200 Turkish Lira.
At the time of publishing the best rate online is £1 = 3.7749 Turkish Lira. You can compare Turkish Lira rates here with Holiday Currency Exchange.
To see how the rate has been against GBP with Google Finance.