hi on switching on my 15 plate tdi octavia estate the symbol for the dpf does not show. i bought the car ex demo from  a skoda dealer. i have never seen the dpf or regen symbol at all.  how should i know if and when the car is doing a regen or if the filter is full?   i do a mimimum 30 miles a working day only on motoway other times up to 50 miles. i never drivr in the city. here is an image of the dash   thanks for helping in advance