hey
yeah i have the same issue
it costs (for parts only) around 9000 czech koruns, which is around £300 from the dealers, excluding labour

Basically what happens is that you can wont move, plus that noise is just annoying! limits you to about 3000rpm, any higher and a loud screeching kinda noise appears

Also be away that the transmission will act up as well after a while if you dont fix it, as the car isnt moving as fast as it should, so the tranny changes down a gear or up a gear, cos its got no brain!

check ebay for parts if you know how to repair it yourself