Same thing - your interest MAY be wiped out (and more) if the exchange rate goes the wrong way.
Think about it as £1 rather than £100,000; You bring over £1 and buy lira (exchange it). The bank give you 2.2 Lira (because the rate is 2.2/£. Later you want to take your lira and turn it back into sterling (in UK or Turkey, doesn't matter) and the rate is 2.8/£.
To get your pound back, you have to give them 2.8 lira. So it costs you 0.6 lira (over 20p) more to buy your pound back that you got for it.
Then finally multiply all those 20p's 100,000 time for each pound you put in [
]
I'm not saying it's a bad idea, it could be a very good idea if the exchange rate went the other way over the time you invested the money (in which case you would be investing a pound, then when you come to exchange back they would want about 80p for each one and you made 20p x 100,000
) plus the interest of course.
What I am saying is it you would be investing huge sum in a market that your own personal skills have no influence over. If the Lira needs to be devalued your 220,000 YTL which was worth £100,000 could be worth half that overnight. It's unlikely but not impossible.
You could make a lot of money, but you could lose just as much. Where it is different for people living here is that the exchange rate is not relevant. You bank lira, you spend lira. What the pound is worth doesn't matter to everyday life.
I hope that made a little sense