Just read about your wash basin. I had a semi recessed Roca pergamon wash basin for five years until a hair crack appeared. I bought a new one and exactly the same thing has happened again after about five years.I have been trying to search the net to see if there is a way to repair it but there does not appear to be any.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix toilets.