Very noisy fast spin on Zanussi 1200 washer/dryer?

I have a 6k 1200 spin Zanussi washer/dryer. 4 years old. Worked fine for 2 years then started making horrendously loud clattering noise when in fast spin cycles. It fills, washes and spins out water fine, and the dryer works ok too (not noisy). It is not moving about when in spin cycle, and if I put my hands on it when in fast spin can only feel it vibrating. Any suggestions re cause of noise?