I think if you are trying to sell a property here then you need to set out your stall and decide whether you will only accept a buyer prepared to pay with GBP or accept payment in lira. In my opinion, if you go for the latter, as in Skunner's example I think you are likely to be disappointed. Even though the property market here doesn't have the relative price discipline seen in the UK, believe me, the local Turkish population know exactly where the price lines are and if you think they will pay an extra 10 or 20 thousand lira because of exchange rate fluctuation, then you are fooling yourself.
That being said, it's always a double edged sword when you move over to a foreign currency, the money I brought over with me is worth significantly less if I were to change it back into GBP while my monthly pension which comes over here in GBP is worth significantly more each month.