Be very carefull Ian as fluctuations in exchange rate can wipe out all interest gains, if you live here and can move your money about quickly there are good amounts to be made, but do not tie your savings up long term, the longest I go for is one month.
an example at 2.6 exchange
20k = 52000 lira
15% interest net over one year = 7,800 lira
59,800 lira total
sounds good until you need to change it back to sterling
If the rates have been kind, say 2.3 = gbp 26,000 = great
If unkind 3.0 = gbp 19,933 = not so good.
Sorry to put a dampner on things but a friend asked the same thing a couple of years ago when the rate was 2,34 and I said dont do it, he did, three weeks later the rate was 2.6.