The 1.6 TDCI is known for turbo issues - basically the oil cannot be drained completely from the engine, and thus it slowly builds up a nice little clog in the engine. Eventually the turbo won't get any oil because it's completely clogged up, and it'll break. (Requiring a new turbo usually)
I believe you can get a third party part to fix it (different oil sump or whatnot, which CAN be drained completely), so maybe ask about that.
It's had a lot of media coverage recently in Denmark (where I'm from)
As Phil 87 says the 1.25 will be very slow though - maybe look at the 1.4 petrol instead?