I have had the light in question come on today on my way home from work. It is a 61 reg Fiesta Zetec S TDCi. I bought the car nearing 11,000 miles just 2 weeks ago tomorrow Friday. My dad and I checked when its last service was which was done by Polar Ford on the 26th of January this year at 10914 miles, the garage i bought it from, so it has probably done the additional 1000 miles moving very short journeys being moved around the lot and on test drives in the months before i had bought it. In the time i have had it however it has done 5 journeys down the motorway in 2 weeks, 1 from wilmslow to wigan, then from wigan to liverpool down the m58 and back twice, enough to get the DPF system going im assuming. all other trips have been anywhere from 1.5 mile trips to my work down the road and back, other times have been 3 - 8 miles trips pottering about. In the 2 weeks of having it for this to happen doesnt feel right and after reading all of the above posts im worried about what i have bought into, i love the car, im getting mileage figures i was hoping for on the trips im doing hoping to get nearing roughly between 370 - 400 miles on the 45 quid i put in it when i got it. im going to check the oil level and see where it is and monitor it, ill be ringing the salesman and see what he has to say about it in the morning.