Clutch buzz?

[basilbrush123]

My Iq suddenly wouldn’t go into gear so the car was recovered and taken to my local garage where they fitted a LUK clutch. The problem is that the clutch pedal now vibrates and I get a buzz when ( I know I shouldn’t) I rest my foot on the pedal.

The garage owner says he has no idea why it’s doing it snd whilst he is prepared to stick another clutch in it, he doesn’t think this is the problem…. 
 

Has anyone had this problem before or can shed some light on what’s wrong?

thanks 

Alan