Vibration at idle after timing belt change

[beachboy]

I have just had my timing belt, tensioners etc , and water pump replaced on a Leon Mk1 110 tdi.
The engine is running fine but there is a noticeable vibration at idle (steady 900 rpm) through the steering wheel and driver's seat. This was not there previously.

From various searches I have found:-

Engine mounting
Bumper/slam panel loose
Injector calibration.

I am taking the car back to the garage tomorrow and I would like to be armed with some information.

What is the most likely suspect?

 

[muddyboots]

My first guess would be a loose engine mount (assuming one has to be removed to change the belt)

 

[beachboy]

muddyboots,
Thanks for that.
I am hoping that the engine mounting is the culprit.

If anybody else has had a similar occurrence after a cambelt change please let me know.