TD4 Vibration at 1250-1500?????

Hi,
Any ideas on this really annoying vibration?
Occurs in any gear at between 1250-1500rpm (if you hold at 1250rpm you can just maintain the vibration) and then accelerate through and it seems to go. Noise is soft not aggressive and comes from front of hippo.
-This is a 52 plate td4. Thanks in anticipation!!

Check ya engine cowel rubbers are not missing /worn. . .

Is the underbelly plate well fixed ? Or your front licenceplate ??

I had this - turned out to be a bit of trim vibrating. Located it by thumping at my wing and following the noise. It was a black bit of placcy under the front bumper right underneath directly down from the N/S headlight. It was sitting just off the front chassis leg so vibrated against it after 1200 RPM and then noise went after 2000 RPM. Annoyed the crap out of me before I found it. Also the airbox resonators are located under the N/S wing and have a habit if vibrating against the inside of the wing. Tugging at the pipe normally cures it. Good luck!

is the vibration through the gear lever? if so there is a mod that needs to be done, there is a bulliten on this.
the ballance weight on the gear linkage needs to be cut in half.

another vibration i've found is the PAS pipes resonating, giving them a little bend to relax them in the mounting will cure this (by the coolant bottle area)