Had a strange one tonight as i was leaving work,went to start the car and all i got was the starter spinning and not engaging.Got it going eventually after rocking it back and forth for a wee while.Made it home and stopped the engine but i thought i'd give it a go again,it started but shuddered about a fair bit until i pressed the clutch and it then cleared.

Could it be just a dodgy starter or is it the dreaded dual mass flywheel? It's a 2004 zetec s TDCI

Any help much appreciated.