Simple Math:
Invest £100k and get 13% interest = £13000
Lira devalues by 11% over the year and your £100k is now worth £89k if you change it back
So in real terms you now have £89k + £13000 = £102k
THEN you have to take into account tax to pay (3%?) on your income so £13k x 3% = £390
£102k - £390 = £101.61k
THEN you should really (if you want to stay withing the UK law) declare the interest on your UK Tax return so that they can add it to your income and deduct tax at your marginal rate.
So unless you are really prepared to keep your money in YTL should it start to devalue against the £ then you should be very careful what you invest.
Would I do it?
Yes - if I had £50k+ that I didn't really see me needing to access for many years to come, if ever at all.
Of course the YTL could always go in the other direction and you could make on both counts
![Smiley :)](http://calis-beach.co.uk/forum/Smileys/default/smiley.gif)