I wondered
the same myself, especially as the pound was appreciating against the dollar and euro. So rather than it being something good with the TL, I suspect that the current depreciation of the euro and particularly the dollar, may have a disproportionate benefit to economies like Turkey and so the TL appreciates against most currencies, not just the dollar and euro.
Mind you I could be wrong in this suggestion, and Reg has been right all along...... Nah only kidding