Ticking noise 1.9PD

Hi all

In December I picked up my new FL 1.9TDi PD, this is my third Octy with the same engine. I'm concerned however over a ticking noise from the engine, I've never heard this on the previous cars and admittedly you can only hear it outside the car, cannot hear it inside. In my mind it's like a ticking injector type noise, car driving ok, although it does a very low mileage, currently only 250 miles in 3 months. Anybody have the same noise or throw some light on it?

Thanks in advance.