I worked it out that if you change your lira back to Sterling at a rate of 2.0ytl/£ and then back again at 2.4ytl/£, you would make around 15-16 months worth of interest (calculated at 15.5% net), so if you think the rate will recover in less that 15-16 months, you make money, if not you loose.
Also, if you think the rate will rise over 2.4, or quicker than 15 months, your quids in.
I wonder what the odds would be on that