zafira b 2006 vibrating clutch pedal and when accelerating?

Suspect dual mass flywheel

cdc
January 2016

From a Google search for "ZAFIRA VIBRATING CLUTCH PEDAL"

http://www.astraownersnetwork.co.uk/archive/index.php/t-63346.html

http://z22se.co.uk/threads/vibration-pulsing-through-the-clutch-pedal-vectra-b.16119/

http://www.hotukdeals.com/misc/vauxhall-zafira-advice-clutch-is-knocking-519572

http://www.zafiraowners.co.uk/forum/21-technical/2729-engine-shudder-vibration-clutch.html

You may get more joy from a dedicated Zafira forum - see some of the above
January 2016