MK II 2010 1.9 TDI slightly rough/vibratory idle and low rpm vibrations

Good evening all. 
 

I recently picked up a 2010 Octavia with the 1.9 TDI 105 BXE engine. I have noticed that, compared to my old high mileage 2006 with the same engine, that at idle the engine seems a touch lumpier an there’s a minor vibration that can be felt in the cabin. 
 

this vibration is accompanied by a vibrating type sound- almost like the sound of the dash being vibrated but I don’t think it is. The sound continues up to around 1500rpm, whereafter it seems to smooth out and sound normal. 
 

car drives fine above 1500, plenty of power, but can be a bit more of a tractor below 1500 which I feel is a quirk of that engine. 
 

any pointers are much appreciated xx